Rhinestone

Historic rhinestone copy of the Florentine Diamond, made in 1865 in Paris by the L. Saemann company
Rhinestones on a tiara
Rowenta enamel rhinestone compact

A rhinestone, paste or diamanté (UK: /ˌdiːəˈmɒnteɪ/ DEE-ə-MON-tay, US: /ˌdiːəmɒnˈteɪ/ DEE-ə-mon-TAY) is a diamond simulant originally made from rock crystal but since the 19th century from crystal glass or polymers such as acrylic.