Stephen Webster Multi-Gem 18 Karat White Gold British Tessellated Necklace Schlumberger Pendant tested as silver-topped 14

Pendant tested as silver-topped 14 karat gold

Centering a round brilliant cut natural brown diamond

Numbered with maker's mark for Oscar Heyman Bros

With signature gold caviar bead at base

Top measures: 11

Stephen Webster Multi-Gem 18 Karat White Gold British Tessellated Necklace Schlumberger Pendant tested as silver-topped 14Centering tapered hexagonal rock crystal quartz backed by sky blue turquoise measuring approximately 21. 0 x 11. 5 mm Surrounded by bezel set square and circle cut gemstones of amethyst, blue topaz, and tanzanite Tessalated around central turquoise doublet and as stations throughout white gold cable chain Completed by lobster clasp With maker's mark for Stephen Webster and British hallmarks for 18 karat gold, London, circa 2015 Length: 16 to 18 inches