Stunning 18K White Gold Pave Diamond Huge Amethyst Bold Ring. This unique piece features one natural emerald cut amethyst, weighing 12.4 carats and numerous brilliant round diamonds totaling .67 carats. The top of the ring measures 7/8 of an inch long by a bit under 3/4 of an inch wide. The ring is a size 7. Sizing is available. It weighs 8.1 grams.