Basanti Darji
PGD8I2601- Practical Gemmology Grading
You followed a gemmology course some time ago? Never heard about golden sheen sapphire or about the new generation of cobalt-treated sapphire? This practice week…
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You followed a gemmology course some time ago? Never heard about golden sheen sapphire or about the new generation of cobalt-treated sapphire? This practice week…
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