What kind of diamonds are in tennis chains?

The kind of diamonds in most tennis chains are the round brilliant cut. The circular shape of the cut works well when set in metal links to create tennis necklaces, and the arrangement of the facets gives the gemstones plenty of sparkle. The sizes of diamonds in tennis necklaces vary. Depending on the thickness of the chain, they may be as small as 2 millimeters or as large as 7 to 8 millimeters. On 1stDibs, find a large selection of diamond tennis chains.