NATURAL TAHITIAN BLACK SOUTH SEA PEARL
Quantity: 1 piece.
Gem Type: Natural Pearl.
Shape: Round.
Size in millimeter: 12.0 Length. 9.0 Width.
Color: TAHITIAN Black.
Clarity: Opaque.Luster: Strong Iridescent.Origin: Tahiti.
Treatment: Unheated, Untreated.
Hardness: 2.5 to 4.5.Refractive Index: 1.530 to 1.685.Specific Gravity: 2.61 to 2.85, normal 2.70.Chemical: Ca Co3.