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How to Differentiate A Real Diamond from Fake at Home?

15 Jul 2020 7:55:00 pm

Diamonds are precious stones that are extremely expensive. Therefore, it’s natural for anyone to want to check if the gemstone in their jewellery really is a diamond. Faking the authenticity of diamonds by overcharging for a poor quality diamond or using a cheap substitute stone instead of real diamonds is actually not very difficult. Certain other stones like topaz, quartz, sapphire, moissanite and cubic zirconia look exactly like a diamond on the surface. These can easily be placed in your jewellery in the place of authentic diamonds by jewellers who want to extort you for money. However, it is also true that they have a shorter lifespan than real diamonds. Nonetheless, the test of time takes a while and you likely want to know that you are investing at the right place almost immediately. 

If your diamond is certified by GIA, it is likely that it is authentic. But, certain jewellers may fake these authenticity certificates. Thankfully, there are certain home tests you can perform on diamonds in order to tell apart a real diamond from fake without having to visit an appraiser and pay an extra fee. Given below is a list of these tests. 

  • Water Test

One way to test if your diamond is real is to put the loose diamond in a glass filled with water. If the diamond floats over or under the water, it is likely a fake. This is because the density of diamond is more than water. However, there are various other gemstones that look like diamond but are heavier than water. So, this test all by itself is not sufficient to prove that your diamond is real. 

  • Fire Test

In this method, you need to hold the gemstone with the help of tongs or fireproof gloves and heat it up on the flame of a lighter. After this, you are supposed to drop it immediately in a container filled with ice cold water. In case the gemstone forms cracks or breaks into pieces, it is not a real diamond. A real diamond has higher heat resistance due to the fact that it is formed under constant heat and pressure. Sometimes, if the diamond is low quality, it can form cracks. In such a case, you should know how much it's really worth once you perform this test. 

  • Scratch Test

For this test, you need a mirror. As the name suggests, you are then required to scratch off the mirror with the pointed edge of the diamond. If this forms scratches in the mirror, your diamond is most probably a real diamond. This is because diamond is a strong element that can scratch through glass. Nonetheless, it's important to remember that this method can chip off some of your diamond. Hence, it isn’t always recommended. 

  • Sandpaper Test

Sandpaper test is the opposite of a scratch test. Here a pure sandpaper is rubbed against a diamond to see if it forms scratches in the gemstone. If you see scratches, your stone is not a real diamond. You can rest satisfied if the sandpaper has no reaction on your gemstone since in such a case it is presumably real. But, it is important to remember that this is not the best checking method and can’t be used all on its own to prove that the diamond is real.

  • UV/ Black Light Test

A real diamond when exposed to black light emits a bluish fluorescence. This won’t be the case for other diamond like gemstones. Although, this is not a rule of thumb. A lot of times, diamonds may differ in composition and may emit other colours. Consequently, while used with other tests, simply by itself, the test doesn’t lead to a conclusion. 

  • Microscope Test

If you observe a real diamond under a strong powered microscope, you will notice imperfections. If a gemstone appears flawless it is probably not a real diamond. Nevertheless, another possibility is that it is a lab created diamond. 

  • Fog Test

As a part of this test, you are supposed to blow over a diamond, be it loose or mounted. You will see fog form over the gemstone. If this stays for a longer time than a few seconds, the diamond is a fake. Real diamond condenses easily and doesn’t retain heat well. 

  • ‘Read Through’ Test

When you put a diamond over a newspaper or a paper with dotted lines, flat side facing upwards, can you read though it? If you can then your diamond is in all likelihood a fake. This is because a real diamond refracts light in different directions unlike a piece of glass. Yet, it is essential to remember that the test cannot be carried out appropriately if the diamond is too small. Other than this, a lot of times, some other gemstone might have similar refraction properties like that of diamonds. 

  • Mounting Check

Real diamonds are often mounted over precious metals like gold, silver, platinum and such. If the metal has engravings such as KT on the jewellery, the gemstone is mounted on gold. In addition, PT or Plat stands for platinum and numbers like 585, 770, 900, or 950 also indicate gold or platinum. But, if you see CZ indicated on your jewellery, the stone is cubic zirconia which is a fake diamond. 

All these home tests are easy to perform but may not yield the most accurate results. It is thereby recommended that you get the gemstone checked by a jewellery specialist who has the needed equipment to determine the authenticity of diamonds and has enough knowledge about gemstones. 

If you are looking for a diamond jewellery store in Nicholls that guarantees GIA certified diamonds, checks your diamonds for authenticity and also provides the best diamond jewellery in Melbourne, All Diamonds is your one-stop shop. Give us a call today.


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