Type: Rock glass Material: Glass This is a rare square rock glass made of the finest French crystal, Sèvres crystal, from the 1990s. It's a beautiful square rock glass with a rippling, wave-like pattern and substantial weight, made of the finest 30% crystal glass, comparable to Baccarat in France. This is a rare vintage rock glass, no longer in production. Some pieces may not have a sticker, but they are unused and have only been displayed.