Stone is 5/8" x 9/16". The silver ketoh itself is 3 by 2.375 inches. The leather is black. It has one set of holes, but it is adjustable, as it depends on how tight one ties the leather straps. It can be worn as little as a size 7.5 inches up to 10.5 inches, comfortably. The owner has authorized us to lower the price from $450 to $385.