Pearl Grading Class at Gemological Institute of America in New York
22.01.2009
So I am in NYC again first thing after New Year to take pearl grading lab class at the GIA. GIA developed and introduced the GIA Pearl Description System in 1998. Every pearl’s value is determined by 7 value factors. They are size, shape, color, luster, surface quality, nacre quality and matching. At the beginning [...]
