Overview An important collar necklace by Jahan. Strands of pearls are strung to form a collar, bordered by pavé-set, brilliant-cut pink sapphires in 18-carat white gold. The large 30 carat central oval-cut ruby mounted in a scalloped 18-carat white gold setting, pavé-set with brilliant-cut diamonds. A bold, impressive and stylish piece of jewellery by one of Switzerland's famed jewellers. Accompanied by a certificate from GCS London stating that the ruby is of Burma origin.