B.C.Sen & Co. Ltd. Manufactures Diamond Ring for Women. This is an ethnic and designer diamond ring in an assorted combination of baguette, marquise and brilliant cut diamonds. B.C.Sen & Co. Ltd. Is the manufacturer of Gold, diamond and platinum jewellery. B.C.Sen & Co. Ltd. Includes necklaces, sets, bracelets, bangles, chains, pendants, mangalsutras, ear-studs, juhmkas, rings, etc. In light and heavy weight categories for traditional and fancy variety in BIS Hallmarked standardized caratages.