9 Carat or 375 White Gold Solitaire Engagement Ring with 7.5 mm or 1.3 Carat White Moissanite. A beautiful classic 4 x double claw solid 9 carat white gold mount. ( stamped 375 for 9 carat gold. Moissanite is regarded as a great alternative to diamonds, with some optical properties exceeding those of diamond. ).