Check for hallmark numberAny hallmark jewellery contains a Hallmark Unique identification (HUID) number that will help to check the authenticity of the piece.
BIS HallmarkThe Bureau of Indian Standards (BIS) hallmark is the official authority that determines the purity of gold. The hallmark consists of karats eg 24k or 22k.
Use BIS Care App It is important to keep the BIS Care App handy on your phone. It allows one to enter HUID and determine the quality of gold.
Acid testIn this, the gold object is covered with a drop of nitric acid. If there is discolouration, it means that the gold is mixed with other metals while no effect on it shows that it is pure gold.
Magnet testThis is a home inspection method. Magnets don't attract real gold but if your jewellery is getting attracted then it contains other metals.
KaratsGold jewellery is available in many levels of purity that are mostly measured in karats. Some common grades are 14K, 18K, 22K and 24K.
Gold testing kitsThis is a professional way of testing the purity of gold. It consists of scratching the gold object on a testing stone, applying various acid solutions and watching the results.