Hydrothermal synthetic red beryl has been produced for jewelry applications by the Institute of Crystallography and an affiliated company, Emcom Ltd., both in Moscow. Diagnostic identification ...
世界の二大ダイヤモンド生産企業、De Beers（デビアス）とAlrosa（アルロサ）は、この数ヶ月間で原石の売上げが激減したものの、現在のダイヤモンド市場は安定しており、米国のホリデー ...
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