Why is gold rate in India given in rupees per gram or in rupees per 10 grams?

Gold is precious and expensive and yet it is very popular among people in India as it is mainly used for making gold jewellery. Gold is also bought as an investment in the form of gold coins or gold bars and are generally available in 1 gram, 2 grams, 5 grams, 10 grams and 20 grams weight varients. Being expensive a common man can afford to purchase gold in small quantities with one gram gold being the minimum amount of physical gold that can be purchased from the local market. In such scenario giving gold rate in kilograms or tons for such an expensive yet commonly used metal simply won't make any sense. Providing gold rate of 1 gram or 10 grams also eases out gold rate related calculation and gives a better idea of the gold rate to the person buying or selling gold locally. 10 grams gold is also popularly known as one tola gold in India.