The Romans in particular were very skillful in the production of coloured-glass pastes, which copied especially emerald and lapis lazuli.With an incréasing demand for jeweIry, the number óf imitations steadily incréased.In 1758 the Viennese goldsmith Joseph Strasser succeeded in inventing a colourless glass paste that could be cut and that superficially approached the sparkle of genuine diamond; the products of this paste are called strass stones.Before 1940 most imitation gems were made from glass with a high lead content.
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