|While extraordinarily rare, blue diamonds are not the rarest. |
They are more uncommon than yellow diamonds, which have nitrogen in them, but they lose out in rarity to green, black, pink, orange, purple, and red.
|The Wittelsbach-Graff is a 31.06-carat, Fancy Deep Grayish Blue diamond with an IF clarity and an unusual cut with 82 facets. The stone sold in 2008 for $24.3 million.|
|A recent find by Petra Diamonds. The 29.6-carat stone was recovered at its Cullinan mine, about 40km (25 miles) north-east of Pretoria.|
Petra unearthed another 25.5 carat blue diamond which sold for $16.9m in 2013.