Gemmology Today issued by the World Gem Foundation where you can read the latest news from the gem world, for free.
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RAPAPORT... Gem Diamonds has recovered a diamond weighing 161 carats from its Letšeng mine in Lesotho.
The miner found the “high-quality” white, type IIa stone on October 28, it said. Including this rough, Gem Diamonds has retrieved five white stones over 100 carats this year. It also produced a further three of that size in other colors.
In 2018, the mine, known for its large, high-quality stones, yielded 15 diamonds over 100 carats.
Over the last year and a half we have collected over 500 FTIR and Photoluminescence spectra of both treated and untreated emeralds from the Shakiso deposit in Ethiopia.