Natural Diamond Prices – December 2024
At PriceScope, we remain dedicated to providing timely and insightful updates on the latest trends in the diamond market. Our expert analysis focuses on the economic and social changes shaping…
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 affect cr...
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 affect cr...
