For spares & repairs to your favourite necklace or bracelet this is a great 9ct yellow gold bolt ring clasp dating from the late Victorian period. The gold has been tested as there are no gold marks. Good secure clasp with a good spring. Diameter 1.2 cm or 0.5 inches. Total length 1.7 cm or 0.7 inches. Weight 1.2 grams or 0.75 penny weight.