MIXTURE FOR PRODUCING JEWELRY CRYSTALS Russian patent published in 1995 - IPC

FIELD: jewelry industry. SUBSTANCE: mixture contains zirconium dioxide JrO₂, stabilizing additive of yttrium oxide and coloring additive of transition or rare-earth element R₂O₃. Mixture additionally contains crystals containing, mas.%: Y₂O₃ 1.5-6.5; Gd₂O₃ 0.5-1.5; the balance, ZrO₂. Mixture components are taken in the following amount, mas.%: ZrO₂ 3-25; Y₂O₃ 1-13; R₂O₃ 0.05-0.50; the balance, crystals. Crystal is grown from melt with use of lining slag with the speed of lowering into cold zone of 20 mm/h. Produced are streaking and opalescent crystals. EFFECT: higher efficiency. 1 tbl