1900-1920ish stunning Black Opal with flects of red blue yellow and green set in 18k white gold manufactured by Belais in NYC. Size 4, sizable, very very good condition. Belais jewelry, from the

Belais Manufacturing Co. (1876-1933) in NYC, is famous for pioneering and popularizing white gold in America, especially during the 1920s Art Deco era, as a substitute for platinum, with their 18k formula often called "Belais Metal".Founded byDavid Belais, the company received a patent for their stable white gold alloy (gold, zinc, nickel) in 1920, becoming synonymous with quality white gold jewelry before the company closed in 1933, making their pieces highly collectible historical artifacts.