18 k white gold with amethyst and diamonds ring

18k white gold setting with a faceted pear-cut amethyst with a total weight of 8.71 ct. It is set "in the air" with two angular claws and an arrow claw. The color is dark purple, with good transparency. On each side is a diamond, set in four straight claws, total weight 0.10 ct. 

Inner band size: 17.50 mm; Front band size: 16 x 11 mm; Total ring weight: 5.20 g