NEW STONE SIZE: 3MM Our most-worn bezel rivière in a new, daintier 3MM size. The James Bezel 3MM Rivière features lab-grown white sapphires in a bezel setting that outlines each stone with a slim border of sterling silver. The Fine Print: Metal: Sterling silver Setting: Bezel Stone Type: Lab-grown white sapphire Stone Shape: Round cut Stone Size: 3MM Carat: 15 inches, 13.02 CTW 16 inches, 13.72 CTW 18 inches, 15.52 CTW What is Lab-Grown?