Ruby Ceramics Pvt. Ltd. Ruby Ceramics Private Limited was established in the year 1986. We are the leading Manufacturer, Supplier, Exporter of Zirconium Silicate (ZR-5), Unique Fine Milled Zirconium Silicate, and Zircon Sands. Manufacturing activity is focused on micronized zircon sand to be used as an opacifier in the ceramic tile & sanitary ware industry. Zircon opacifier is produced by milling natural zircon sand, is widely used under the brand name "ZR" as an opacifier. The current range, ZR-5 & ZR-10 are used as ceramic opacifiers in the tile industry, while ZR-200 & ZR-300 are zircon flours used by the ceramic frit manufacturers and by the foundry industry.