A gold item is tested before it is purchased by a jeweller or gold dealer to guarantee that it is of high purity. This is the only method for determining if an object is totally comprised of gold. A touchstone is included with an essay test kit, as well as multiple dilutions of nitric acid at various quantities. Slate is the touchstone, a black acid-resistant rock with black colour. The goldsmith uses the touchstone to mark the gold object by softly rubbing it across it. After that, they alternate between using each of the acid solutions to disseminate the mark. The higher the gold content of the metal, the less likely it is to be harmed by acid.
You may be familiar with the term karat (abbreviated K or kt), which refers to the most widely used measure of gold purity. The karat is a measuring scale that spans from 0 to 24. As a result, a one-karat piece of jewellery is made up of one part gold and 23 parts other metals or alloys, as shown in the diagram. Purity can be stated in terms of a percentage or a number of parts per thousand. You may convert karats to percentages using the formula below. Multiply the value by 100 after dividing the carat number by 24. To figure out how much gold is in your 20-karat ring, divide 20 by 24. As a consequence, the gold content is 83.3 per cent (or 0.833 per cent) (which also translates to 833 parts per thousand).
How to Use the Karat Number to Determine Gold Purity
If you want to know how much gold is in your jewellery, you’ll need to know its carat weight. Find out how to count the amount of karats in your gold to determine its purity. If you’ve never done it before, buying gold may appear to be a routine and uncomplicated activity. Your gold purchase might end up being a complete waste of money due to your lack of knowledge about the metal you’re purchasing. Investing in gold is not for the faint of heart. On the other hand, it is not a difficult task. You can ensure that your purchase is genuine and useful by following a few simple procedures. If you’re buying gold or already own it, how can you know if it’s pure?
It is a simple and basic technique to check the purity of gold jewellery or gold coins before acquiring them. The Bureau of Indian Standards (BIS), a government organisation that certifies the purity of gold, goes through a process of labelling each piece of gold with precise information in order to assure the purity of gold purchased through authorised merchants or online platforms. If you check for this information or the Hallmark, you may be sure that the gold you’re buying is pure. The hallmarking procedure is required by the British Institute of Standards (BIS) to safeguard the general public from tampering and to compel gold makers to adhere to legal fineness and purity criteria. The BIS should analyse the following four qualities of hallmarked gold jewellery to confirm that it is made of pure gold:
The Assaying and Hallmarking Center has signed
The emblem of the laboratory that assessed the purity of the gold used to produce the item of jewellery you’re wearing is the third mark on it. Only BIS-licensed laboratories are permitted to conduct purity checks on the product and to stamp their mark on it. You may find out if a hallmarking centre is licenced by the BIS by visiting their website and conducting the appropriate investigation.
Two significant criteria to examine are karat and fineness
The second mark ensures the amount of pure gold contained inside the jewellery, in addition to certifying the karat (denoted by the letters KT or K) and fineness number. Because 24K gold is soft, it is combined with metal alloys such as silver and zinc to create a more durable gold that may be used to make jewellery. As of January 1, 2017, only 22K gold, 18K gold, and 14K gold will be eligible to bear a hallmark, according to the Bureau of Indian Standards (BIS). There were once other levels of hallmarking available, including 23, 21, 17, and 9, but they have all been phased away.
The Bureau of Industry and Security’s symbol/logo
When you see the BIS logo on gold jewellery that has been hallmarked by the BIS, it implies that the purity of the item has been independently certified by a BIS-licensed laboratory. Every piece of jewellery or cash you get will have this insignia on it, making it simple to recognise the thing you’ve acquired in the first place. An organisation that has been approved by the government The Bureau of Indian Standards (BIS) is the only agency in India that is licenced to mark the purity and authenticity of gold objects.
In addition, not all jewellers offer jewellery that has been BIS-hallmarked, as it is totally voluntary. This does not deter a small number of local jewellers from selling their products with uncertified in-house hallmarking on them. You must thus check that the BIS mark is present on any gold jewellery you intend to purchase before proceeding with your purchase.
The jeweller’s distinguishing mark is seen here
When you purchase something from the store or online, you will receive a piece of gold jewellery that has the store’s or website’s logo on it. This symbol may be displayed by a jeweller or jewellery manufacturer who has been approved by the BIS.