Sterling silver. 7mm across. Wear on its own or stack with our other gemstone charms 19735//P19735 and 19736//P19736 on one of our chains 19331//P19331 19332//P19332 19330//P19330 or 19696//P19696 . Or add any one of our charms 19339//P19339 19334//P19334 19333//P19333 19337//P19337 19338//P19338 19336//P19336 and 19335//P19335 .