May10,2025
Once listed in the Guinness Book of World Records as the world’s rarest gemstone.
Over 1,000 times rarer than diamonds.
A color-changing gem rarer and costlier than diamond.
Extremely rare, often mistaken for spinel but far more valuable.
A bluish-green gem mostly found in Madagascar, prized for its rarity.
One of the rarest gemstones on Earth, with few confirmed specimens.
A rare aluminum borate mineral valued by collectors.
An ultra-rare gem found only in Sri Lanka and Myanmar.
Changes color from blue-green in daylight to purple in incandescent light, rarer than diamond.
The most valuable type of opal, prized for its dark body tone and brilliant play-of-color.