Flat back sew-on stones Preciosa MC sew-on flower (MC Loch Flower) are very popular one-hole sew-on Preciosa stones, which we offer in several sizes and which are an alternative to the SWAROVSKI 3700 Flower Sew-on Stone. Machine cutting and polishing ensures a precise cut and impeccable sparkle of each stone. Bottom side of these original Preciosa cut stones is finished with a layer of simili for even better shine and optimal optical properties.