The 7 Rarest Gemstones in the World (And Why)

What Makes a Gemstone Rare

"Rare" gets used loosely in jewelry marketing, but in mineralogy it has a specific meaning: how often a mineral forms at all, how often it forms in crystals clean enough to cut, and how many places on Earth it has ever been found. A stone can be chemically common but rarely gem-quality (most garnet), or it can be a mineral so geologically specific that it has only ever turned up in one mountain range. The gemstones below are rare in that second, stricter sense — some are rarer, carat for carat, than diamond by a wide margin, simply because so little of them has ever been found in a form worth cutting.

Painite

For decades, painite held the Guinness World Record for rarest gem mineral on Earth. It was first identified in the 1950s by British gem dealer Arthur C.E. Pain, who brought back unusual brownish-red crystals from Myanmar that turned out to be a previously unknown borate mineral. For nearly 50 years, only a small handful of painite crystals were known to exist worldwide. A larger deposit was eventually located in Myanmar's Mogok region in the 2000s, which brought more rough material to market — but painite faceted into a clean, eye-clean gem for jewelry is still exceptionally uncommon, and most mineral collections consider a specimen a prize.

Red Beryl (Bixbite)

Red beryl is a member of the same mineral family as emerald and aquamarine, but colored red by trace manganese instead of the chromium or iron that tints its cousins. It forms in a very narrow set of geological conditions — gas cavities in rhyolite lava — and gem-quality crystals are found in commercial quantity in essentially one place: the Wah Wah Mountains of Utah, with a smaller occurrence in Utah's Thomas Range. Most crystals that do form are too small, included, or fractured to cut into a faceted stone, which is why a clean red beryl over one carat is considered a significant find.

Grandidierite

Grandidierite is a blue-green to blue-grey mineral first described in 1902 in Madagascar and named for French explorer and naturalist Alfred Grandidier. For most of the 20th century it was known only as an opaque mineral specimen — transparent, facetable crystal was essentially unheard of. Gem-quality grandidierite remained so scarce that for years only a few cut stones existed in the world, mostly from Madagascar with later finds in Sri Lanka. Its rarity, rather than striking color saturation, is what makes it prized among collectors.

Musgravite

Musgravite was first identified in 1967 in the Musgrave Ranges of South Australia, the source of its name. It belongs to the same mineral family as taaffeite (below) and is chemically very close to it, which made the two easy to confuse for years. For a long stretch after its discovery, fewer than a dozen faceted musgravite gemstones were documented worldwide. Additional sources have since been found in Madagascar, Greenland, and Antarctica, but gem-grade material remains scarce enough that most jewelers will go an entire career without handling one.

Jeremejevite

Jeremejevite is an aluminum borate mineral named after the Russian mineralogist Pavel Jeremejev, who first described it from a find in Siberia in 1883. For over a century, well-formed, transparent crystals suitable for cutting were almost unknown. That changed somewhat with the discovery of better-quality blue jeremejevite crystals in Namibia's Erongo region in the 1970s and later, which remains the source of nearly all gem-quality material cut today. It is still rare enough that few gemologists have examined one in person.

Taaffeite

Taaffeite has an origin story unlike any other gem on this list: it is the only gemstone first identified as a cut, faceted stone rather than as a raw crystal. In 1945, Irish gemologist Richard Taaffe was examining a parcel of cut spinel gems in Dublin when he noticed one stone behaved differently under testing — it was doubly refractive, while spinel is singly refractive. Further analysis showed it belonged to an entirely undescribed mineral. Taaffeite has since been found in small quantities in Sri Lanka and Tanzania, but remains rare enough that the original specimen's discovery — finding a new mineral already sitting cut in a jeweler's tray — has never been repeated with another gem.

Benitoite

Benitoite is a deep-blue barium titanium silicate best known for its intense blue fluorescence under ultraviolet light. It was first found around 1907 near the headwaters of the San Benito River in California and, despite exploration elsewhere, gem-quality benitoite has never been found in significant quantity anywhere else on Earth. California named it the official state gemstone in 1985. Because the original mine has been largely worked out, new material is scarce, and faceted benitoite over one carat is considered a serious find even among specialist dealers.

Why You Won't See These in Everyday Jewelry

None of the stones above are cut for mass-market jewelry, and for good reason: supply is measured in specimens, not carats per year, and most of what's mined is too small, included, or structurally unstable to facet at all. That's precisely why personalized jewelry brands, FARUZO included, build collections around accessible birthstones instead — garnet, amethyst, peridot, citrine, and the like — set in materials that are consistent, durable, and ethically sourced at real production scale. Our pieces are made from 316L stainless steel with a plated finish, chosen because it holds an engraving cleanly, resists tarnish, and is nickel-safe for everyday wear — not because it competes with a museum mineral collection. Rarity like painite's or benitoite's belongs to geology and collecting, not to a piece you can order personalized with a name or a date.

Frequently Asked Questions

What is the rarest gemstone in the world?

Painite held the Guinness World Record for rarest gem mineral for decades after its 1950s discovery, when only a handful of crystals were known to exist. A larger source was found in Myanmar in the 2000s, but gem-quality cut painite is still extremely uncommon.

Is red beryl rarer than diamond?

Red beryl is far more geographically limited than diamond — gem-quality crystals come almost entirely from Utah's Wah Wah Mountains — and clean, cuttable material over one carat is considered a significant find, which is why it commands prices well beyond typical colored gemstones.

Why are some gemstones found in only one place on Earth?

Certain minerals form only under a narrow, specific combination of geological conditions — particular host rock, temperature, pressure, and chemistry — that happens to occur in just one deposit worldwide. Benitoite (California) and red beryl (Utah) are both examples of single-locality gem minerals.

Does FARUZO sell rare gemstones like these?

No. FARUZO's personalized jewelry uses accessible, ethically sourced birthstones set in 316L stainless steel with a plated finish. The ultra-rare minerals in this article are collector and museum specimens, not stones used in everyday production jewelry.