750 means that the gold content of the necklace is 75%, which is 18k gold, 18k gold is an alloy with a gold content of 18/24, and the remaining 25% is other precious metals, including platinum, nickel, silver and palladium. 18K gold is a kind of gold ornament with low cost and comfortable wearing.

D0 140ct, D stands for diamond, C stands for carat, usually abbreviated as ct, and 0 140ct stands for diamond size of 0. 1 4ct,1carat = 100, 0./kl.