Independent assurance of the quality of your diamond

Certified diamonds

If a diamond has been independently graded by a gemological laboratory, it is termed a certificated or certified diamond. At Ingle & Rhode, virtually all of our diamonds above 0.3ct (and some smaller stones) are supplied with laboratory reports confirming their size and quality.

There are more than twenty organisations around the world that offer these reports. Amongst the best known of these are the Gemological Institute of America (GIA), American Gemological Society (AGS), the International Gemological Institute (IGI), and the Diamond High Council (HRD) in Antwerp.

There are minor variations in the way in which these different organisations grade diamonds, but they all focus on the ‘four Cs‘ (carats, colour, clarity and cut). Diamond certificates should also tell you whether the diamond exhibits a natural phenomenon called fluorescence.

Avoid buying based only on the certificate

It is important to be aware that not all the laboratories are equally reliable. If you’d like to learn more, please read our blog post on “The Truth About Diamond Certification”.

Even where a certificate has been issued by the most reputable of laboratories, we still recommend that clients, wherever possible, view diamonds in person, so that they can judge the relative beauty of each stone for themselves.

Take for example two diamonds, both graded by the same gemologist as G colour.  One may be on the cusp of being an F colour, while the other may be on the cusp of being an H colour. A certificate will not tell you this but the two stones will be a discernibly different colour.

Another gemologist might grade one diamond as VS1 clarity and another as VS2. But the VS1 may be on the cusp of being a VS2 and the VS2 on the cusp of being a VS1. The vast majority of people would look at them and see no difference, but the one certified as VS1 might be 10% more expensive than the VS2. 

Certificates of origin

All of our diamonds can be traced back to mines in Canada and Australia, which means that we can guarantee that they are conflict-free. All but our smallest Canadian diamonds come with certificates of origin in addition to their gemological certificates.

Browse our collections or commission a bespoke design



Browse our collections or commission a bespoke design

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Call us on 020 3468 7917 or come and see us in person at our showroom close to Bond Street station, London. You’ll be able to discover our stunning collection, speak to our experts one-on-one and explore the option of creating your very own bespoke ring. We aim to respond to appointment booking emails within 1 hour.

CALL 020 3468 7917

Visit us at 14 Gees Court, London W1U 1JW, but please note that visits are by appointment only.