18K Diamond and Emerald Necklace For Sale at 1stDibs Emerald with Diamond Pendant Set in 18 Karat Gold Settings For Sale at Emerald and Diamond Pendant in 18ct Gold Pendants Lockets Jewellery Emerald and Diamond Pendant in 18K Yellow Gold For Sale at 1stDibs Emerald and Diamond Studded Pendant in 18 Karat White Gold For Sale at. A simple and elegant pendant set with a rectangular emerald measuring approximately 5 3 mm (estimated weight 0. 30 carats). Above the emerald is a small round diamond measuring 1. 4 mm, adding a subtle accent of brilliance. The pendant features a hallmarked bale and is suspended from an 18 carat gold neck chain measuring 18 inches in length. Total combined weight: 2. 1 grams.