11mm. We found these wonderful vintage Miriam Haskell glass faux pearls in stock from an old New York design house. They are round in shape and drilled through the backside like a button. Use them as a cabochon or sew them on to a design. You won't find glass faux pearls any prettier than Miriam Haskell stock. They won't last long! You will receive 24 of these beautiful glass pearl button beads per lot.