Understanding A Diamond Grading Report

Beautiful, Brilliant and Rare. Diamonds are the most desired gems on Earth. Each one is unique in its own way and no two diamonds are identical. Diamonds are valued based on their qualities referred to as the 4 C’s, Carat, Clarity, Color and Cut.

Some of you might have heard of the term Certificates, here at Diamonds For Less we refer to them a lot, but you might be confused as to what it means and how to understand them. In this blog post we will try to explain all the terminology and information you would find on Diamond Certificates.

First of all, what is a Diamond Certificate or Diamond Grading Report? They are documents that have been issued most of the time by a third party that has physically seen the diamond and has given it its quality grading, note that I say most of the time? That’s because in some cases the seller issues their own certificates and you should be wary when someone grades their own product as they are biased and will most of the time favor themselves, as a consumer you have very little experience to confirm or deny what they say.

Certificates sometimes seem complex and confusing; When you visit Diamonds For Less we will always present you the corresponding certificate to the stone you are looking at and explain to you in detail all the different categories , below we will break it down one by one.

  1. Grading Laboratory (This refers to the lab that has graded the diamond, there are many different companies that provide this service, the most known are GIA, GS Labs, IGI, HRD)
  2. Date of Issue (The date that this diamond was inspected and graded not when the diamond was produced. Diamonds are millions years old)
  3. Grading Report Number (This is the number that the corresponding Laboratory has given the diamond they have graded, often this is laser inscribed on the diamond)
  4. Measurements (Measured in millimetres these numbers represent the physical dimensions of the stone, first 2 numbers represent diameter for rounds or length and width for all other shapes, the 3rd number is the height)
  5. Carat Weight (Unit used to measure weight in diamonds is Carat, 1ct=100points, 5cts=1gram)
  6. Color Grade (Indicates the shade of color, scale is D-Z starting from colorless all the way down to light yellow)
  7. Clarity Grade (Indicates the purity of a diamond, the absence or existence of imperfections)
  8. Cut Grade (Describes how well the diamond was cut from rough to polished to maximize its brilliance)
  9. Polish and Symmetry Grade (Is almost self explanatory, Polish refers to how well it was polished by the cutter and Symmetry to how symmetrical the diamond is)
  10. Proportion Diagram (This shows all the percentages and angles the diamond has been cut to)
  11. Clarity Mapping (The inclusions are marked on a diagram of the diamond and then each imperfection is explained in detail to what it is, e.g crystal, feather, cloud etc.)

This is an example of a certificate by GIA.

certificate of GIA

If you have any questions, request or concerns feel free to contact Diamond For Less and one of our diamond experts will be happy to assist you or answer any of your questions.