"Let's Read & Talk about Gemology" with Antoinette L. Matlins
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"Let's Read & Talk about Gemology" with John L. Emmett
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How to Check Emerald Transparency | Polishing Rough Emerald Stone |
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"Let's Read & Talk about Gemology" with John I. Koivula
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Let's read & talk about Gemology with Richard W. Hughes, author of "Ruby & Sapphire"
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Best Jade Collection in Mine Area
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«30 years in Bangkok from Treatments to Gem Cutting & Trading», with Karim Guerchouche
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Ethiopian Emerald - Green Fire of Ethiopia
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