1 янв 1400 г. - Jean d'Outremeuse (1338 in Liège – 1400)

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Tresorier de philosophie naturelle des pierres precieuses (A Lapidary, or the History of Pretious Stones) - by 14th C Jean d'Outremeuse has first three books like lapidary tradition; also talks about differentiating real and fake gemstones, with instructions for testing as well as recipes for making gemstones of glass

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