Our bestselling stud earrings! We can't keep these earrings in stock. These are fantastic for anyone with an active lifestyle! Made of 24K gold vermeil or sterling silver with genuine semi-precious stones. All of the stones sell well, but the best selling stones are: aqua blue chalcedony, all the druzies, rainbow moonstone, and labradorite. The dimension of the stone is 1/2 inch by 1/2 inch.