One of the important fact in the gold jwellery is Hallmark (i.e BIS mark). (From wikipedia -The BIS hallmark is a hallmarking system for gold as well as silver jewellery sold in India certifying to the purity of the metal. It certifies that the piece of jewellery conforms to a set of standards laid by the Bureau of Indian Standards, the national standards organization of India.)BIS mark on earring -
(Information source: BIS Website) BIS hallmark for gold jewellery consists of several components:
- The BIS logo.
- A three digit number (out of a set of six pre-defined values) indicating the purity of the gold in part-per-thousand-format viz; 958, 916, 875, 750, 585, 375. Corresponding to 23 carat,22 carat, 21 carat,18 carat,14 carat and 9 carat respectively.
- Logo of the assaying center.
- Year of making
- Jewellers Identification Mark.