OVAL Rhinestone Gems Acrylic Flat Back Jewel Colors ~ Smooth ~ Facet ~ Solid ~ Sew On Acrylic Rhinestone Flat Backs OVAL Mixed Pack. Gems are 18x25mm and 20x26mm, in assorted bright jewel colors as shown. A mix of faceted and smooth gems. 100 grams/over 3oz /Approx 65 gems. No two packs are the same. Most are flat for gluing but there may be a few with holes for sewing. Great for arts, crafts, costumes, theater, home decor, etc.