916 vs 750 vs 585: Understanding Hallmark Numbers Before Buying or Selling Gold Gold jewellery is not just a fashion choice in India — it represents tradition, investment, and family memories. But whenever you buy or sell gold, one small number stamped on your jewellery decides its actual purity and value. You may have noticed numbers like 916, 750, or 585 written on gold ornaments. These are hallmark numbers that tell you how pure your gold really is. Understanding these mar