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Research blog

News

Date : 24/03/2020
Category : Research Blog

In October 2017, a team of gemmologists from the SSEF had the privilege to visit some Paraiba tourmaline mines in Brazil to get impressions about mining procedures, sorting, cutting and trading activity in the states of Paraiba and Rio Grande do Norte....

Date : 18/03/2020
Category : Research Blog

Fancy sapphires found in recent years in Madagascar brought to light colour stability issues. Some of these samples show an unstable colour, shifting from pinkish orange (padparadscha-like) to pink after a fading test are reported. We report on research findings on these stones and explain...