There is a very simple & affordable formula to calculate the Value of Old Gold Jewellery.
Take the possessions of gold/jewellery to a gold testing or assaying lab. Have it tested for purity. The lab will give you a test report which will state the accurate weight of the sample & its purity in percentage or karats.
In the case of karat purity,
Value of Gold in the sample = (Weight of Gold x Purity of Gold x Rate of Gold today) / 24
In the case of percentage purity usage,
Value of Gold in the sample = (Weight of Gold x Purity of Gold x Rate of Gold today) / 100
Note: This guideline is only provided as a reference for the customer to calculate an approximate value of their old gold.