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I hope to learn a lot about Precious Stones

I am a diamond and colored stones cutter, writer of the book Hardness 10 (in French, Dutch, English and Chinese). Also \”La taille des pierres de couleur\” in French and Italian. See more on www.expetrt-diamond.com
Co writer of \”The Brillant Story of Antwerp Diamond\” and the handbook Pierres Précieuses (French/English) by ING PARIS.