The world's rarest gem is believed to be painite, a gem that most have never even heard of. Rarity does not equate to beauty in gems, however. The painite is an orangish or reddish brown, with the brown tint coming from iron in the crystal. It was first discovered in Burma in the 1950s and was widely considered to be the rarest of all gems, with only two faceted crystals in existence.
The DeYoung Red Diamond is one of the largest known natural fancy dark red diamonds. It is a modified round brilliant cut diamond that has a clarity grade of VS-2 and weighs 5.03 carats. The diamond was acquired by S. Sydney DeYoung, a Boston jeweler, as part of a collection of estate jewelry in which it was wrongly identified as a garnet. It was gifted to the National Gem Collection by Mr. DeYoung in 1987.
A STUNNING COLOURED DIAMOND AND DIAMOND RING, BY MOUSSAIEFF DESIGNED AS A FLOWERHEAD, SET WITH A HEART-SHAPED FANCY RED DIAMOND WEIGHING APPROXIMATELY 2.09 CARATS, WITHIN A PETAL SURROUND SET WITH SIX PEAR-SHAPED DIAMONDS WEIGHING APPROXIMATELY 1.07 TO 1.01 CARATS, ACCENTED BY BRILLIANT-CUT DIAMONDS, TO THE SIMILARLY-CUT DIAMOND THREE QUARTER-HOOP, MOUNTED IN 18K WHITE GOLD,