Gem diamonds in Delta Gem’s D-to-Z range usually decrease in value as the color becomes more obvious. Just the opposite happens with fancy color diamonds: Their value generally increases with the strength and purity of the color. Large, vivid fancy color diamonds are extremely rare and very valuable. However, many fancy diamond colors are muted rather than pure and strong.
1 in 10,000
Only one in 10,000 diamonds has a fancy color.
$71.2 million
In April 2017, the Pink Star diamond,
59.60 carats, became the most expensive
gem ever auctioned.
Hope Diamond
The 45.52-carat Fancy Deep grayish blue Hope Diamond is the world’s most famous gem.
Facts
- Mineral: Diamond
- Chemistry: C
- Color: All colors
- Refractive index: 2.42
- Birefringence: None
- Specific gravity: 3.52
- Mohs Hardness: 10