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Diamonds 102

Diamonds 102

After posting our Diamonds 101 we asked you on Instagram if you wanted a part 2 with more detail and you said yes, so here it is!

Diamond Certificate

Often referred to as the 5th C - along with the well known 4C’s: cut, clarity, colour and carat - a diamond certificate is essential when buying diamonds. When you purchase a diamond, you should always make sure it is certified by an Internationally recognised Diamond Laboratory: we recommend GIA as they’re known to be the strictest and most consistent when it comes to grading diamonds.

We always recommend that diamond certificates are independent of the company selling the diamond. For example, companies like Diamonds Factory and Vashi sell ‘Self-Certified’ diamonds; meaning they can set the 4C’s to whatever they like. The retailers that do this tend to above self-certify their diamonds to increase their profit margins. Because of this it’s crucial that a diamond is certified through an unbiased and professional examination. 

If you’re wondering, certified means to confirm formally as true, accurate or genuine: to guarantee as meeting a standard. In the case of diamonds, being certified means that a diamond is verified as being either 100% natural or ‘enhanced’, that the quality of the diamond meets a certain standard, in the opinion of a qualified gemologist.

A certificate tells you about the gems’: shape and dimensions, carat weight, colour and clarity grades, standard of finish (for example polish, symmetry and girdle width) and, in the case of Round Brilliant diamonds, cut grade.

Diamond Score

At Quality Diamonds, we’ve developed the diamond score - a method of scoring each diamond that takes into account the 4C’s as well as the following attributes: the gemological laboratory that certified the diamond, table percentage, depth percentage, polish, symmetry, fluorescence, girdle and length to width ratio.

What we do is give every diamond a score out of 10 for each of the 12 attributes. You’re then given a score between 1 and 10 for each diamond, so you can easily see compare diamonds rather then going into detail which takes much longer if you don’t know much about diamonds.

Conflict-Free Diamonds 

There are diamonds that are mined and shipped without any connection to rebel or terror groups. Diamonds that do have these connections are known as conflict diamonds or blood diamonds, they originate from war-torn areas and are illegally traded. 

Luckily now over 99% of diamonds are conflict-free due to the Kimberley Process Certification Scheme being put into place in 2002. All diamonds sold buy Quality Diamonds have been obtained from suppliers working within this scheme.

Jewellery Valuations

Valuation helps you to understand why a specific diamond is so valuable, sort of like a diamond score and certificate. It gives you the overall value of the jewellery you’re buying, this is important for insurance purposes. 

Valuations are based on similar attributes as the diamond score and certificate, as well as the jewellery metal type - for example, 18K yellow gold.


If you wish to go to our expert advice which is more in depth, click here.

If you wish to learn more about our Bespoke services, click here.

If you wish to contact us, click here.

Find us on Instagram @QualityDiamonds