18ct White Gold 1.90ct Diamond 16.51ct Tanzanite Oval Cluster Necklace PW350TZ This sublime necklace features a huge 16.51 carat oval Tanzanite which showcases the beautiful lavender blue colour for which this highly prized gemstone is famous. Held by four claws in an 18 carat white gold setting, this rare gemstone is surrounded by brilliant cut pave set diamonds which continue onto the two interlocking circles above. The top circle provides a clever hidden bail, meaning that there is no interruption to this sleek and contemporary design. The 18ct white gold chain is 18 inches long - a standard length for most necklines. Tanzanite 16.51ct, Diamond 1.90ct