B.C.Sen & Co. Ltd. Manufactures Ladies Diamond Necklace. The Ladies Diamond Necklace is a rhombus shaped designer creation in brilliant cut diamonds set to stiff gold links. This is also available in floral motifs depicting nature`s beauty in gold. This gold necklace comes in 42 grams weight with 5.3 carats 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.