Your Grandma's pearls could never. 18K Gold plated brass. Typical size range: 6–8 (women) / 8–10 (men) US Size Inside Diameter (mm) Inside Circumference (mm) 6 16.5 mm 51.9 mm 7 17.3 mm 54.4 mm 8 18.1 mm 56.9 mm 9 18.9 mm 59.5 mm 10 19.8 mm 62.1 mm To keep your piece looking its best, we recommend avoiding long exposure to water. Like all plated jewellery, frequent contact with moisture can cause fading over time — keeping it dry will help preserve its colour and shine.