It takes 250 tons of earth to be sifted to find one carat of rough diamond crystals. Only one diamond crystal in a million carats mined will be large enough to cut into a one carat diamond. Diamonds have been found in every color of the rainbow. If the color is vivid the diamond is considered a fancy color. Fancy colored diamonds are priced based on the rarity of the color.
Most diamonds exhibit a slight tint of color, typically, a light yellow or light brown. The lighter the tint the more rare the gemstone. Therefore, a colorless diamonds graded D on the GIA color scale will command a higher value than a diamond that is in the near colorless range, graded as H.
Today there are many treatment used to enhance colored or mask the the extent of inclusions in diamonds. Diamonds can be drilled with a laser and then boiled in acid to bleach the color from dark inclusion.
Diamonds can be filled with a glass like substance that masks the location and appearance of internal fractures. Clarity enhanced diamonds are not as durable as untreated diamonds.
Repair work or cleaning performed on an item of jewelry containing treated diamonds is limited by the nature of the foreign material used in the treatment process.
Diamonds can be exposed to radiation salts, subatomic particles in a cyclotron or to neutron bombardment in an effort to improve the stone’s color. Often these colors are more vivid than the colors found in nature.
Diamonds can be coated to improve color. A coating that resist ordinary solvents can mask a diamond’s yellow body color.
It is best to purchase your diamonds from a trained gemologist that is able to identify these treatments and protect you from purchasing a treated diamond at an untreated diamond’s price.
The art of grading a diamond for value takes years of training and more years of experience. If you don’t know diamonds, choose your diamond dealer with care. Look for individuals who are Graduate Gemologists or Certified Gemologists with the American Gem Society