Exclusive pendant with deep blue Topa's gemstone, which reflects the light in the most beautiful way. Can be worn in both a necklace or bracelet. 18K white gold, diamond and topas. North London Blue pendant is made in 18K white gold. Set with this magnificent 0.90ct baguette-cut London Blue Topas as well as their RO Signature diamond. Brill. 0.003ct tw.vs. The pendant measures 9 x 5 mm without the box .. This pendant is also made in 18K gold.