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strass stone
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strass stone

imitation gem
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Quick Summary

Strass stones are imitation gems made from a heavy, transparent flint glass that mimics the brilliance and fire of real gemstones. This glass has high refractive indices and strong dispersion, meaning it separates white light into its component colors.1

The term "strass" specifically refers to a colorless glass paste invented in 1758 by Joseph Strasser. This paste could be cut and polished to closely resemble the sparkle of a diamond. Before 1940, imitation gems were often made from glass with a high lead content, mixed wet to ensure even distribution, hence the term "paste". Pigments can be added to create various colors.1

While softer than natural stones, strass stones have a higher index of refraction and dispersion, giving them great brilliancy. They can be identified by rounded edges on molded imitations, air bubbles, a warm feel to the touch, and a specific type of fracture pattern.1

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