Craftsmanship
Hallmarks
Hallmarks, sometimes also known as fineness marks, indicate the metal at the core of your jewellery piece rather than the outer plating and denote the content of precious metals within.
Common hallmarks
Yellow, white, and pink gold
990 = 24k gold = 99.9% gold
750 = 18k gold = 75% gold + alloy
585 = 14k gold = 58.5% gold + alloy
416 = 10k gold = 41.6% + alloy
375 = 9k gold = 37.5% gold + alloy
Silver
S925 = sterling silver = 92.5% silver + alloy