Jewels Of The Week: June 2022
June is flabbergastingly in the rear view, it’s hard to believe how quickly time is moving! PriceScopers continue to hit it out of the park when it comes to new…
Executive Director, AGS Laboratories and Gemological Sciences
Last 5 articles of this author
The Effects of Indexed Upper Half Facets
by Peter Yantzer, CG
American Gem Society Laboratories
Gemstone cutters can tilt or 'index' the upper half ( or upper girdle ) facets. This indexing produces different amounts of weight retention from a given piece of rough and produces different optical performance effects. Indexing can also affec...
The Effects of Indexed Upper Half Facets
by Peter Yantzer, CG American Gem Society Laboratories Gemstone cutters can tilt or 'index' the upper half ( or upper girdle ) facets. This indexing produces different amounts of weight retention from a given piece of rough and produces different optical performance effects. Indexing can also affec...
