Book: *Treatise on the Physical Characteristics of Gemstones, to Aid in their Identification Once They Have Been Cut* by Abbé HAÜY , published by Courcier, Paris, 1817
Book: *Treatise on the Physical Characteristics of Gemstones, to Aid in their Identification Once They Have Been Cut* by Abbé HAÜY , published by Courcier, Paris, 1817