Gem Country of Origin

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2024 – Possibilities and limitations of origin and treatment determination of major gemstones – Part 1
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2024 – Possibilities and limitations of origin and treatment determination of major gemstones – Part 2
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2024 – Colored stones Spectroscopy
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2024 – History of origin determination of gemstones
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2022 – “Gem Country of Origin”- RUBY & SAPPHIRE
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