• Length: 18" • Adjustable to 21" • Large 20mm Natural Pink Cultured Biwa Coin Pearl • .925 Sterling Silver Chain and Cap • CZ Findings and Fillagree • .925 Sterling Silver Lobster Claw Clasp • Brand New with a Sleek Black Gift Bag • Ships Same Day Mon-Sat Sterling silver is made of 92.5% of pure silver, as the name implies, and the rest (7.5%) mainly comprises of copper and other trace elements. 925 sterling silver is better than pure silver, as it is soft, rendering it easier to shape for fine jewelry manufacturers.