Only a handful of mines are known to have yield fancy blue diamonds, with the most prolific source being the Cullinan mine in South Africa.
Natural Fancy Colored Blue Diamonds
Extremely rare, blue diamonds comprise less one-tenth of a percent of all fancy colored diamonds. The color is the result of the presence of boron atoms in the carbon crystal lattice of the stone. Most blue diamonds are Type IIb, which means that are devoid of the nitrogen atoms that tend to provide a yellowish hue, but even rarer Type Ia blue stones do include nitrogen, sometimes providing them with a pale green appearance.
Top 10 Fancy Color Diamond Suppliers:
1. MID House of Diamonds 2. Novel Collection 3. Leibish & co 4. Kun ming Diamonds 5. P. Hirani