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terminology

Engraving II, Diamond-point engraving

The technique of decorating glass by scratching the surface with a diamond. Diamond-tipped tools may have been used by the ancient Romans and in the medieval Islamic world, but they were popularized by the Venetians in the 16th century. Diamond-point engraving was carried to some of its greatest artistic heights in the Netherlands during the 17th century. Today, other hard materials, such as tungsten carbide, are used instead of diamonds.

source Corning Museum of Glass