Very Special Clasp here! We have taken a Rare, beautifully faceted 8mm Vintage Article #4650 Swarovski Crystal and set it in a tall manner into a single strand, sterling silver box clasp. Results... .stunning!!! This clasp is 11mm square. If you measure the clasp from loop to loop it's 20mm x 11mm. We think that the perfect clasp makes a perfect finish to any jewelry design. Adding a Swarovski crystal sterling silver clasp will set your designs apart from all the rest.