Your single diamond necklace has just gotten an upgrade! The ultimate piece to keep it classic and chic on a daily basis. This necklace is 18k gold and can be worn at 18" or adjust as tight as 10" for that choker feel. This is the core piece to your everyday layering look! 18k solid yellow gold, white gold, rose gold 0.20 carat total weight Adjustable, 10" -18" " The fact this necklace is adjustable is genius, I can wear it tight and layer longer necklaces around it, or wear it longer, and I…