Glass gem marbles are dome-shaped globs of glass with flat bottoms that can be used as glass mosaic tile in craft and mixed-media mosaic. These glass gem are American made by Marble King and have more intense colors and better clarity than most Asian gems. The glass gems are sold by the half pound. The count of 65+ gems is a NOMINAL count only, which means the bags can contain less than 65 pieces when they are running large. The gems are APPROXIMATELY 5/8" in diameter. They are NOT uniformly circular but are slightly irregular in shape. Use our Quick Order Checklist to order rapidly using a list.