Diamonds get all the attention, but they are not even close to the rarest thing pulled from the earth. Some gemstones are so scarce that fewer than a hundred pieces exist anywhere in the world, and a few have only ever been found in one small patch of ground on one mountainside. These stones rarely end up in stores, because there simply isn’t enough of them to sell. Most live in private collections, university drawers, or museum cases, and a handful of collectors travel across continents just to see one in person. Understanding what makes a gemstone truly rare, rather than just expensive, changes how every colored stone in a jewelry case gets seen.
What Makes a Gemstone Rare
A gemstone is rare when very little of it exists in gem quality anywhere on Earth. That’s the short answer. But rarity isn’t just about how pretty or expensive a stone is; it’s about supply.
A stone can be rare for several different reasons. Sometimes the mineral itself is common, but clear, well-colored crystals big enough to cut are almost never found, like with some sapphires. Other times, the mineral only forms under a very specific set of geological conditions that barely ever happen on this planet, so the entire known supply comes from one mine or one mountain range. Painite, for example, was known from only two crystals for decades after its discovery. Diamonds, by comparison, are mined by the ton every year across more than a dozen countries, which is exactly why true rarity and high price don’t always mean the same thing.
It also helps to understand that “rare gemstone” actually covers two different situations. Painite, taaffeite, benitoite, kyawthuite, jeremejevite, musgravite, and poudretteite are entire mineral species that exist nowhere else in nature, full stop. Red beryl and tanzanite, on the other hand, are rare color varieties of a mineral that’s otherwise fairly common: red beryl is chemically the same species as emerald and aquamarine, and tanzanite is a variety of zoisite. Both situations produce genuine scarcity, but a brand-new species with a global supply of a few dozen crystals is a fundamentally different kind of rare than a familiar mineral that just happens to turn the right color in exactly one place on Earth.
Painite: The World’s Rarest Gem
Painite is the gemstone most gemologists point to as the historic gold standard for rarity, because for over 50 years almost none of it existed. The mineral takes its name from Arthur Charles Davy Pain, a British mineralogist who came across the first confirmed crystal in Myanmar, then still known as Burma, sometime in the early 1950s. Convinced at first that he was holding a ruby, Pain handed the stone over to London’s Natural History Museum for a closer look, and the lab work there revealed something nobody had ever catalogued before.
Decades passed before anyone found another one. A second sample surfaced not long after, and it wasn’t until 1979 that a third turned up, tucked inside a parcel of unsorted rough that gemologists at the Gemological Institute of America happened to be sorting through. The count stayed painfully low well into the new millennium: by 2004 the entire known supply sat somewhere south of two dozen stones, low enough that Guinness World Records named it the planet’s rarest gem mineral in 2005.
That same year, Myanmar’s miners struck a fresh, sizeable pocket of painite-bearing rock, and the supply that followed let cutters and dealers finally build up an inventory numbering in the hundreds rather than single digits. Even so, the gem is still hard to come by today, and nearly all of it still traces back to that one region of Myanmar.
Painite forms in Myanmar’s Mogok Valley, part of a mountain belt created when the Indian and Eurasian tectonic plates collided millions of years ago, the same geological squeeze that also produces the region’s famous rubies and sapphires.
Painite’s color runs from a deep orange-red to a brownish red, and it owes that warmth to small amounts of chromium and vanadium mixed into its structure. Crystals are almost always small, and the largest one ever recovered is only about an inch long, yet even that modest piece has been valued in the millions of dollars because so few others exist to compare it to. Most painite mined today still comes from small-scale, artisanal digging in Myanmar rather than large industrial operations, which keeps the supply chain slow and the stone firmly in collector territory.
Red Beryl: Found in Only One Place
Red beryl is a deep raspberry-red gemstone, and unlike almost any other colored stone, its entire commercial supply traces back to a single claim. Every crystal clean enough to facet has come out of the Ruby-Violet claims, tucked into the Wah Wah Mountains of Beaver County, Utah.
Its color comes from trace manganese locked inside a beryl crystal, and getting that to happen takes a strange coincidence of timing and chemistry. Enough beryllium needs to be sitting in the rock to form crystals in the first place, manganese needs to show up in that same spot at the same moment, and the surrounding rock chemistry needs to hit exactly the right balance for the two elements to lock together instead of drifting apart. Miss any one of those conditions and nothing red ever forms, which is why the gem stays so hard to find.
Size works against it too. Even the biggest specimens ever pulled out of the Wah Wah claim top out around two centimeters across and five long, and the typical gem-grade piece is smaller than a fingernail. Most cut stones end up weighing a quarter carat or less once faceting is finished. Rarity estimates differ depending on who’s counting, but figures in the range of a thousand times scarcer than diamond come up often, with roughly one carat of red beryl recovered for every million carats of diamond that leave the ground.
Red beryl was actually found once before, back in 1904, in Utah’s Thomas Range, but it took until 1958 for anyone to find crystals good enough to cut into gems. A prospector named Lamar Hodges stumbled onto that gem-quality material in the Wah Wah Mountains while he was actually searching for uranium, not gemstones at all. High-quality faceted red beryl can sell for thousands of dollars per carat today, putting it on par with fine emerald despite being far scarcer, and the Ruby-Violet claim itself changed hands again in 2020, when it was acquired by Red Emerald Inc.
Taaffeite: The Gem First Found in a Jewelry Store
Taaffeite has one of the strangest discovery stories of any gemstone, because it wasn’t dug up in a mine at all. In 1945, gemologist Richard Taaffe bought a batch of cut and polished stones from a jeweler in Dublin, Ireland, thinking they were ordinary spinel.
One purple stone in the batch didn’t behave the way spinel should. The gem was doubly refractive, meaning it bent light in two different directions, while spinel, like diamond and garnet, only bends light one way. Curious about the mismatch, Taaffe sent it off for lab testing, and the results confirmed it belonged to a species nobody had ever classified before. Taaffeite remains the only gemstone in history that was first identified from an already-cut and polished stone, rather than from a raw crystal pulled out of the ground.
Because most old taaffeite had been mistaken for spinel for years before anyone noticed the difference, nobody knows how many pieces might still be sitting unrecognized in old jewelry collections. Confirmed taaffeite remains extraordinarily scarce, and it’s usually named alongside painite and kyawthuite as one of the three rarest gemstones on Earth.
Most of the world’s taaffeite now comes from Sri Lanka, though it has also turned up in small amounts in Tanzania and China. It typically shows up in soft shades of lavender, mauve, and violet, though pink, red, green, blue, and even colorless examples exist. Unlike some rare gems that are too fragile for daily wear, taaffeite scores 8 to 8.5 on the Mohs hardness scale, which is durable enough to hold up in a ring or bracelet. That combination of rarity and durability is part of why the small number of cut taaffeite stones that reach the market tend to sell quickly.
Benitoite: California’s State Gemstone
Benitoite is a bright blue, diamond-like gemstone whose entire commercial history runs through one small patch of California. No other mine anywhere has ever produced facet-grade material, which makes the Benitoite Gem Mine in San Benito County the sole commercial supplier the trade has ever known.
A prospector named James Couch found it in 1907 while searching the hills near the San Benito River. He initially thought he’d struck sapphire because of its brilliant blue color, but a UC Berkeley mineralogist later confirmed it was an entirely new mineral. Two years after the discovery, it was officially named benitoite after the county and river where it turned up.
Benitoite’s rarity runs deeper than just supply, right down to how its atoms are arranged. Crystallographers had mapped out 32 theoretical symmetry classes long before benitoite came along, yet two of those slots sat empty for decades because nobody had ever actually found a mineral that fit them. Benitoite finally filled one, becoming nature’s sole known example of what’s called the ditrigonal-dipyramidal class. Total output has stayed tiny to match: the mine’s lifetime production adds up to somewhere around 5,000 carats of cut material, with most individual stones tipping the scale at under a carat. California recognized the stone as its official state gem in 1985.
Benitoite has an unusually high dispersion, which is the property that splits white light into flashes of color, and its dispersion is actually higher than a diamond’s, giving well-cut stones a fiery, sparkly look. It also glows a vivid blue under ultraviolet light, a trick that gem hunters and museum curators sometimes use to spot it. On the Mohs scale it sits at a 6 to 6.5, softer than a diamond or sapphire, which is one reason most benitoite ends up in pendants and earrings rather than rings that take daily knocks. Commercial mining at the original site ceased in 2006, so nearly every stone available today came out of the ground more than fifteen years ago.
Grandidierite: Madagascar’s Rare Blue-Green Gem
Grandidierite is a striking blue-green gemstone that stayed almost mythical among collectors for a century after it was first described. French mineralogist Alfred Lacroix first identified it in 1902 at a pegmatite outcrop on the southern coast of Madagascar, and named it after the explorer Alfred Grandidier.
For most of the twentieth century, the material that turned up was cloudy and dull, nowhere near clear enough to cut into an actual gem. The picture only started changing around 2000, when transparent crystals appeared in Sri Lanka, followed by a genuinely new gem-grade deposit found in southern Madagascar in 2014. Even that discovery didn’t flood the market: total output from the 2014 find has stayed close to 300 carats of usable rough, a figure so small that many colored gemstones produce more than that from a single decent mining season.
The stone fights back against cutters, too. Its internal atomic layers give way cleanly along two separate directions, so a lapidary shaping a rough piece has to work carefully to avoid the crystal splitting apart mid-cut. Pair that fragility with how little rough exists in the first place, and it becomes obvious why a finished grandidierite gem almost never turns up outside a specialist show.
Grandidierite also plays a color trick that few other gems can match. It’s strongly trichroic, meaning a single crystal can show three distinct colors depending on the angle it’s viewed from, typically shifting between dark blue-green, a pale colorless tone, and dark green. At 7.5 on the Mohs scale, it’s reasonably hard, but its tendency to cleave means it still needs careful handling once it’s set into jewelry. Most of the finest examples found so far have stayed in the hands of the small number of collectors and dealers who acquired them directly from the Madagascar and Sri Lanka finds.
Tanzanite: Tanzania’s Rare Blue Gem
Tanzanite stands apart from most rare gems because ordinary shoppers actually recognize the name, even though its supply is far more limited than diamond’s. Every gram of it traces back to one patch of ground: the Merelani Hills, a stretch of foothills below Mount Kilimanjaro in northern Tanzania.
The gem was discovered by accident. In 1967, a Maasai tribesman in northern Tanzania noticed the ground glowing unusually in an area called Merelani, and went to take a closer look. What he’d spotted was a violet-blue variety of the mineral zoisite, unlike anything gemologists had catalogued before.
For a gem this famous, the source ground is remarkably small. Estimates put the productive stretch of the Merelani Hills at somewhere around seven kilometers, a sliver of land that accounts for the entire global supply and is the reason tanzanite is often ranked about a thousand times scarcer than diamond. Because there’s no second deposit waiting in reserve, output is expected to shrink rather than grow as the years pass.
Geologists consider it extremely unlikely that tanzanite will ever be found anywhere else in the world, since the exact geological accident that created it happened only once, roughly 585 million years ago.
Tanzanite doesn’t come out of the ground looking blue. In its natural state, the mineral is usually brownish, and it takes gentle heating, sometimes done underground naturally, but mostly done by hand today, to bring out the violet-blue color the gem is known for. Tiffany & Co. recognized the gem’s commercial appeal almost as soon as it reached the West and rebranded it as “tanzanite” in 1968, dropping the mineral’s technical name, blue zoisite, because sales staff worried the word sounded uncomfortably close to a much darker one. That marketing push, paired with a source that geologists expect to run dry within a few decades, has made tanzanite one of the few truly rare gemstones that most people have actually heard of.
Kyawthuite: Only One Crystal Exists
Kyawthuite holds a title no other gem can claim: science has only ever confirmed one crystal of it, anywhere on the planet. That lone stone, a faceted gem in a warm reddish-orange, tips the scale at 1.61 carats and now lives in a display case at the Natural History Museum of Los Angeles County.
Its story began in 2010, when a gem hunter working the alluvial streambeds near Mogok, Myanmar, picked up a small, water-worn crystal that looked like it might be topaz or amber. It ended up in the hands of Dr. Kyaw Thu, a Burmese geologist who bought it at a local gem market because it felt heavier and shinier than it should have. Lab testing eventually confirmed it wasn’t any known mineral at all, and in 2015 the International Mineralogical Association formally approved kyawthuite as a brand-new species, named in Kyaw Thu’s honor.
What makes kyawthuite so puzzling to scientists isn’t that it’s built from impossibly scarce elements. Its formula combines bismuth and antimony, two metals that are uncommon but far from vanishingly rare in Earth’s crust. The mystery is how those elements ever assembled into this specific crystal structure in the first place, since nothing else like it has turned up anywhere else on the planet despite over a decade of searching. Until a second crystal surfaces, kyawthuite remains, quite literally, one of one.
Jeremejevite: Often Mistaken for Aquamarine
Jeremejevite is a pale, sky-blue gemstone so rare that many working gemologists go their entire careers without ever holding a cut one. It was first identified in 1883 on Mount Soktuj in Siberia, but those original crystals were colorless and far too small to interest jewelers.
The gem stayed a scientific curiosity for nearly a century until 1973, when blue crystals turned up in Namibia’s Erongo region and were initially mistaken for aquamarine. That Namibian find is what turned jeremejevite from a mineralogist’s footnote into a genuine, if still extremely scarce, gemstone. It has since also been found in small quantities in Myanmar, Madagascar, and Russia, but Namibia remains the source of nearly every gem-quality crystal that reaches collectors.
Jeremejevite is durable enough for jewelry, sitting at 6.5 to 7.5 on the Mohs hardness scale, and its color ranges from colorless to violet and golden yellow, though the clear, pale sky-blue stones are the most prized. Nearly every faceted stone shows visible inclusions, since flawless jeremejevite is almost never found, and top-quality pieces have been known to sell for more than two thousand dollars per carat simply because so little of it exists to compare against.
Musgravite: One of the Rarest Gems Known
Musgravite is close chemical kin to taaffeite, but it’s considered even harder to find. It was first identified in 1967 in the remote Musgrave Ranges of South Australia, which is where it gets its name, though the original samples were too small and unremarkable to be recognized as gem-quality material for decades.
More than a quarter century passed between the mineral’s discovery and the first time anyone actually cut a gem-quality piece, which didn’t happen until 1993. Small quantities have since been reported in Sri Lanka, Madagascar, Greenland, and Tanzania, yet by most estimates the combined worldwide haul of facetable musgravite, added up across every stone ever cut, still falls short of 1,000 carats. Separating it from taaffeite required real lab work for years, since the two look so similar that plenty of stones sold under one name turned out to be the other once someone ran them through Raman spectroscopy.
Musgravite typically appears in muted gray-green, olive, or violet tones rather than taaffeite’s brighter purples, and it shares the same durable 8 to 8.5 Mohs hardness, so it holds up well in jewelry once it’s set. Because so little of it exists, fine musgravite can fetch tens of thousands of dollars per carat at auction, putting it well ahead of diamond on a pure rarity-to-price basis.
Poudretteite: A Gem Decades in the Making
Poudretteite spent nearly forty years as nothing more than a mineralogical footnote before anyone realized it could be a gemstone. It was first collected in the 1960s at a quarry in Mont Saint-Hilaire, Quebec, run by the Poudrette family, but the crystals were so tiny that the mineral wasn’t formally described in scientific literature until 1987, and even then nobody thought it had any gem potential.
The turning point came in 2000, when a pink stone bought in the gem markets of Mogok, Myanmar, didn’t match anything the buyer recognized and was sent off for testing. It came back as poudretteite, this time in rough clean and large enough to actually facet. Confirmed finds stayed remarkably scarce even after that: by 2004, dealers in Mogok had identified only around ten specimens, and a clean stone weighing over a carat is still considered a genuine event. The single largest piece of rough recovered there tipped the scales at 22 carats before cutting brought the finished gem down to 9.4 carats, still one of the largest poudretteite stones on record.
Poudretteite typically appears in soft pastel pink to violet shades, and its two confirmed sources, one quarry in Canada and one valley in Myanmar, remain the only places it has ever been found on Earth. No laboratory-grown version exists on the market, so every poudretteite gem in circulation is a genuine natural stone formed under conditions rare enough that geologists still aren’t entirely sure how it happens.
Why You Won’t Find These in Jewelry Stores
Most jewelry stores don’t stock these gemstones because there simply isn’t enough supply to build a reliable business around them. A jeweler needs to be able to reorder a stone when it sells, and with something like grandidierite or benitoite, there may be nothing left to reorder for years at a time.
Collectors and museums also tend to hold onto rare stones once they get them, which keeps supply even tighter. Auction houses occasionally see pieces from private estates come up for sale, but a piece can just as easily vanish back into a private vault for another few decades. That’s part of why prices for these stones can swing so widely: there’s no steady market feeding a predictable flow of new stones the way there is with diamonds, sapphires, or emeralds.
| Gemstone | Primary Source | Discovered |
|---|---|---|
| Kyawthuite | Mogok, Myanmar | 2010 |
| Painite | Mogok Valley, Myanmar | 1950s |
| Musgravite | Musgrave Ranges, Australia | 1967 |
| Red Beryl | Wah Wah Mountains, Utah, USA | 1904 |
| Jeremejevite | Erongo Region, Namibia | 1883 / 1973 |
| Taaffeite | Sri Lanka (first identified in Dublin, Ireland) | 1945 |
| Poudretteite | Mont Saint-Hilaire, Canada / Mogok, Myanmar | 1960s / 2000 |
| Benitoite | San Benito County, California, USA | 1907 |
| Grandidierite | Southern Madagascar | 1902 |
| Tanzanite | Merelani Hills, Tanzania | 1967 |
Frequently Asked Questions
What is the rarest gemstone in the world?
Kyawthuite currently holds that title, since only one confirmed crystal has ever been found, discovered in Myanmar in 2010. Painite held the record for decades before that, and taaffeite and musgravite are usually mentioned in the same breath, since new discoveries and mine finds can shift the ranking over time.
Are rare gemstones always more expensive than diamonds?
Not necessarily. Price depends on demand as much as supply, and many of these rare stones aren’t widely known outside the gem-collecting world, so demand stays limited. A stone can be far rarer than a diamond in terms of total supply while still selling for less per carat, simply because fewer people are looking to buy it.
Can rare gemstones be worn safely in everyday jewelry?
It depends on the specific stone’s hardness and durability. Some rare gems, like taaffeite, are hard enough for regular wear, while others are softer or more prone to cracking and are usually better suited to occasional-wear pieces or display rather than daily use. Anyone buying a rare stone for jewelry should ask a jeweler about its specific hardness and care needs first.
Why haven’t more deposits of these rare gemstones been found?
Each of these stones forms under a very specific combination of heat, pressure, and chemical elements that rarely occurs in nature. Geologists have searched extensively in similar rock formations around the world, and in cases like tanzanite, they consider it extremely unlikely that a second deposit exists anywhere on Earth.
Do rare gemstones hold their value over time?
Scarcity tends to support value over the long run, since there is a hard ceiling on how much new supply can ever enter the market. That said, value also depends on cut, clarity, color, and how well-known a particular stone becomes with collectors, so rarity alone doesn’t guarantee a stone’s price will rise.
The Bottom Line
Painite, red beryl, taaffeite, benitoite, grandidierite, tanzanite, kyawthuite, jeremejevite, musgravite, and poudretteite each tell a different story about how rare a gemstone can actually be, whether that’s a single mine in California, a single valley in Tanzania, or a single confirmed crystal sitting in a museum case in Los Angeles. What ties them together is that each one exists in such limited supply that geology, not marketing, sets the price ceiling. The next time someone calls a stone “rare,” it’s worth asking exactly how many of them actually exist, because for these ten gems, the honest answer is sometimes just one.
