How to Know the Quality of a Diamond

Diamonds are the luxury embodied. Having jewelry with diamonds is a dream of every woman, and every caring and successful man should be able to fulfill it! However, buying diamonds is a risky business, as customers are usually not aware of multiple small details, which can change the actual value from thousands to dollars. How to know the real quality of a diamond you are about to buy you will know from this article.


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    Ask for a certificate. Every stone should be appraised and issued a certificate. Of course biased appraisers will write whatever boutique owner needs, so certificates should be issued by a respectable authority. Certificate should be up-to-date, as absence of regular appraisal shows some possible issues with the stone.
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    Do your homework. Stamp GIA on a certificate is not 100% grant it is real. Gemological Institute of America Inc. (GIA) is the world-known facility, trusted by all shop owners and customers. However their certificate appraisal costs quite a sum, while Gemology Institute of America (GIA) is a fake issuing fakes. Do not be fooled by abbreviations, so browse and write down the names of the most popular and trusted appraising companies.
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    Breathe on it. Take the gem with pincers and breathe on it. Real diamonds disperse moisture at once, so the stone will remain clear. Fakes will have spots of moisture on them and if you breathe on them for some time, it will begin condensing, while real diamond will remain clean.
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    Heat the stone. As diamonds disperse heat immediately, the real stone will remain cold after heating them by a lighter for 30 seconds. This is a standard check you can and should require to be done in your presence.
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    Try to look through it. Diamonds are not silicon, they are carbon and their inner structure prevents light from passing through directly – that is why they are so shiny. Place a stone on a paper with a text. If you see only a black spot, this is diamond. In case you see some lines and shapes, this is obviously a fake. Placing a real diamond on a dot on a sheet of paper will result in a black spot visible through it. Fake will show circle instead.


  • Have a diamond quality tester with you. This is not the cheapest solution, plus it does now qualify the grade of the stone, but it is a definite proof if the stone is a diamond or not. When slightly touched to a real gem, it beeps. No matter how hard you press it to anything else, it remains silent.
  • Take it off the showcase. Showcases are usually brightly lit, so diamonds look sparky and shiny. In real life you will most likely wear them under sunshine or normal or shaded lighting. Diamonds looking blue under the fluorescent light might appear yellow in the shadows, which means both the stone and the certificate are fake. Just leave the place without regrets.
  • Look for the real weight. Jewelers prefer to state the total carat weight of the diamonds in the prices for accessories. However, you surely understand 6 carat weight for a single stone is much higher than for 3 stones 2 carat each. So feel free to ask the weight of the biggest stone in the jewelry piece, as it should be stated in the certificate.
  • Have a scope with you. If the stone is not mounted, look it from all sides. Finely cut diamonds do not have fractures and cracks, they are flawless. In case this is not so and there are some fissures, the price is much lower, of course and this should be reflected in the certificate. However, as many flaws cannot be seen with bare eyes, having a scope would be a wise decision.
  • Have an UV light with you. Due to the crystalloid structure of the diamond, it shows blue aura when exposed to the intense UV light. If it does not, or shows bleak yellow aura – most likely this is not a true diamond. By the way, when exposed to light, diamonds give no reflections, while zircons or other low-quality stones do, as their structure is very similar to the glass.
  • Have portable electronic weights with you. The fake weighs nearly 1.5 more than the diamond of that size. Compact weights with carat scale will show you the difference easily, so having them with you if your intent is buying diamonds without the frame would be a wise decision.


  • Know about 4 C’s. The overall diamond quality is described through the 4 C’s: carat, color, cut and clarity. This topic is vast and is best described on the sites of GIA and other respected appraisers. If you spare some time to research it, you will be able to see if you are told the truth or lied to with a cold blood.
  • Consult with a specialist. No matter how legitimate and valid the certificate seem, additional appraisal would not be excessive. Some minor flaws like laser drills can be located only using special equipment only a professional appraiser possesses. Just don’t take the closest to the store or their partner.
  • Paying the pledge may be risky. To issue an additional appraisal you should pay the pledge to be able to take the stone out of the store without actually buying it. However, many vendors refuse to return the pledge in case appraisal shows different results, than stated in the certificate. Make sure you have a signed treaty that in case of purchase cancellation due to any reason, you will have your money back. Otherwise you may face a situation when these funds may be applied only as a discount to your next purchase or cannot be refunded due to some other reason.
  • Have a copy of the vendor’s certificate. In case your appraisal shows different results, the vendor may accuse you in swapping the stones. Having a copy of the original certificate not only allows the appraiser to make the test results more comparative, but also protects you.
  • Avoid buying on trips. While boutiques in the US and Europe are law abiding and comply with the laws and policies, most of the vendors worldwide do not. Buying on a trip on Caribbean or in Brazil, or in Singapore will most likely result in buying fake or overpaying. Diamonds are a serious business and rush is a bad advisor.

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Categories: Jewelry and Watches