Gold Topaz Flat Back Sew On Oval Acrylic Rhinestone Beads are 18x25mm or 1/16" x 1" in diameter. These jewels have 2 holes for sewing that are about 1mm in diamater. Perfect for jewelry making, fabric embellishments, garments, Costume making, cosplays, clothes and shoes. All of these gems have silver flat back foil (non see through) except black that is opaque (full black covered).