sri lanka lectroplated monocrystalline diamond stone durable

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  • Министерство образования и науки РФ

    2021-8-10 · Sri Lanka Ceylon Sri Lankan sapphires are found in Etruscan jewelry (600-275BC), making it the oldest sapphire source known to be used by western countries. The Greeks and Romans wore Sri Lankan stones and they are aptly described by writers from the period. Production has been relatively steady and constant throughout history.

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