IDGL Diamond and gem grading


IDGL has been providing an independent diamond and gem stone grading service of the highest quality to the jewellery trade for over 10 years.

As well as providing certificates for modern cut diamonds, we also specialise in second hand / antique jewellery which generally does not come certified. With our sophisticated gem weight computer, we can calculate gem weights of mounted stones.


We issue four main types of certificate:

  • Diamond Grading Report £25 per item
  • Full Diamond Grading Report £30 per item
  • Coloured Stone Report £25 per item
  • Gem Stone Report £25 per item

A range of valuation, custom and bespoke reports
are also available.


You can access our services a number of ways:

  • Onsite: We will visit your premises
  • By Post: send your items to us
  • In person: visit our Leeds operation

We guarantee a rapid turnaround time for our postal service.

Please note our prices are negotiable, depending on your volume of work.

We are confident in the value of our services.

  1. According to the GIA, a certificate definitely helps to close a sale.
  2. Our certificates increases customer confidence in the retailer.
  3. A certificate acts as an ID for the item in case of subsequent loss or damage.
  4. Finally our certificates helps a sales assistant who is not gemmologically trained to explain to a customer all the technical information contained therein, thus saving time and developing more of a relationship with the customer.


Trade references are available here. We have many satisfied customers throughout the UK.

Finally, thank you for visiting our site and if you need more information take a look at our services, certificates and credentials pages and our gallery showing us at work.


"Just because it looks and shines like a diamond, doesn't necessarily make it one."
: Edmond Mbiaka

Diamond Grading
Using our mobile laboratory
with sophisticated equipment.

Grading Certificates For
Items of All Value

Click here to contact us


IDGL Chief Gemologist Mr. S. Chung F.G.A. Recipient, G.I.A. Diamonds and Diamond Grading Certificate.