Pearls are the most unique type of organic gem. They are the only gemstone which comes from a living creature. Their value depends on many factors, like size of the pearl, luster, shape and if it's surface is clean or not. The oyster that it has come from has a great impact on the final price of the pearl.

Pearls, unlike diamonds, don´t have a standardized system for grading them and estimate their value. An expert should appraise them by following these quality factors:

Size - The bigger, the better.

Shape - Round Pearls are more valuable than teardrop or baroque drop shapes, although there are precious pieces of Jewelry created with these pearls.

Colour - Depends on each type pearl. On Golden South Sea Pearls, the deeper, the better. They should be golden, not Yellow. In the case of White South Sea Pearls, the color should be “paper“ white.

Lustre or Luster - The market values more the metallic luster, in the pearls with a high luster, you can see the reflection of the person in them.

Surface - The cleaner, the better. Pearls usually have birthmarks, which may impact on their value.

Nacre Quality - The thicker, the better. 

Matching - The Jeweler who created the Necklace or Pair of Earrings should pick pearls which match on Color.