Articles from May 2016

A color that is specific to tanzanite, and one which is desired especially by gem collectors, is a green-violet mixture displayed as an unusual zoning within the crystal. After fashioning and polishing, due to the facets angles, the colors merge and produce a remarkable metallic color. A 6.31-carat emerald-cut tanzanite, offered by Advanced Quality ACC, was brought to Gemewizard® for color analysis. Since its metallic color was clearly visible, we decided to analyze each color component of the gem separately, using a polarizing filter.

In Part I, we discussed the effect of a Brown or brownish second color moderator on the price of colored diamonds. In Part II herein, we shall explore the effects of Gray and grayish second color moderators on the overall appearance and value of a stone.

Some fancy colored diamonds possess a third color in their grading reports. These third colors, referred to as second color moderators, may either be Brown, brownish, Gray or grayish. Generally, the brown tint is found in diamonds with warm body colors (such as Yellow, Orange, Pink, Red, etc.), while gray is found in the cooler colors (Blue, Green, Violet).