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sapphire

Gem Price Guide

Rubies All sizes $1 to $15.ct   S KASHMIR SAPPHIRE Certified origin. Untreated material. Average brilliancy of 40 to 60%. Add to 20% or…

Zircon Buying Guide

13.00-ct blue zircon from Cambodia. Treatment is uncertain. Designed and crafted by Erik Stewart. 18kt yellow textured gold accented with natural…

Tangent Ratioing

Sapphire. The critical angle for Quartz is 40.49 degrees, the critical angle for Sapphire is 34.62 degrees. By using Tangent Ratioing you can…