Calculating the Cost of Gold Investments: What 1000 Rupees Cost in 1947 is Worth Today

When purchasing gold, buyers often pay attention to its purity, for example, whether it is 24-karat or 22-karat. It is generally known that 24-karat gold is the purest, while gold of 22, 20, or 18 karat purity contains other components. However, it is not always clear exactly which substances are added to these alloys.

Why is 24-karat gold not used for jewelry?

Despite having the highest purity, 24-karat gold is also very soft. Due to this softness, it is impossible to create jewelry from it or set stones in it. Therefore, other metals are added to the alloy to give strength to the items and ensure the secure fixing of precious stones. The purity of 24-karat gold is 99.9 percent, and it practically lacks other metals; it is more often used for coins, gold bars, and investments.

Composition of 22-karat and 18-karat gold

In 22-karat and 18-karat gold, there is no intentional weakening of the metal by adding substances such as iron. 22-karat gold means that out of 24 parts, 22 parts are gold, and the remaining 2 parts are other metals. Thus, it contains about 91.6 percent pure gold and 8.4 percent of other materials. These additional metals usually include silver, copper, zinc, and sometimes nickel or palladium. The choice of these additions depends on the jeweler and the design.

20-karat gold contains 83.3 percent pure gold and 16.7 percent of other metals, which also include silver, copper, and zinc. Increasing the proportion of metals makes the jewelry stronger. Furthermore, 18-karat gold contains 75 percent pure gold and 25 percent of other metals. This option is very popular for jewelry with diamonds and stones because it is more durable.

It is important to note that the addition of metals to gold is done to increase its strength and change its color. For example, copper is used to give gold a slight reddish tint, while silver and other metals are used to achieve a yellow or white tone. In India, the Bureau of Indian Standards (BISIS) sets gold purity standards through stamping: for example, 22K must contain 91.6% gold, and 18K must contain 75% gold. However, BIS usually does not specify exactly which metals and in what ratio should constitute the remaining part (8.4%, 25%, or 41.5%). This is determined by the manufacturer's technology and design, provided that the finished product meets the declared purity, but every 22-karat item is guaranteed to contain 91.6% gold.