Czechoslovakia is a popular term with collectors. The name, first used as a mark after the country was formed in 1918, appears on glass and porcelain, other decorative items, and costume jewelry that was often marked on the spring rings in necklaces and bracelets. Although Czechoslovakia split into Slovakia and the Czech Republic on January 1, 1993, the name continues to be used in some trademarks. For more information, explore our identification guides for glass jewelry, costume jewelry, and other glass.