English
Summary: Presents a brief history of the development of synthetic diamond and corundum, from Henri Moissan through Verneuil. Also highlights the role the House of Heller played in financing and assisting Verneuil, which lead eventually to the House of Heller's complete line of "Hope" stones including ruby, sapphire, emerald, zircon, as well as Deltah pearls, turquoise matrix, and others.
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Ebook · Golconda in the laboratory · L. Heller & Son · Internet Archive
Precious stones, Artificial · Diamonds, Artificial · Corundum, Artificial--History · Synthetic rubies · Synthetic sapphires