Diamond Certification & Reports

Our Promise

All of our diamonds above 0.3 carat come with a certificate or report from an Independent Diamond Grading Laboratory. We realise that you are buying over the internet and therefore need to be confident in your purchase. Certificates are a way of identifying your diamond, and also allow you to be confident that when you pay for a certain stone, then it is what we say it is.

Your diamond certificate is completed by a gemmologist (a diamond expert) outling the specific features of your diamond in detail.

Examples of How Diamond Quality Affects Ring Price

A diamond certificate identifies the individual characteristics that determine the quality of a specific diamond:

  • Diamond Cut: How expertly is was cut and polished. To make a diamond really sparkle it must be cut to very precise symmetry and dimensions.
  • Diamond Clarity: Clarity outlines exactly what flaws are apparent in the diamond. Some stones are flawless, but most have some level of flaws. Tiny flaws will not affect the performance of a diamond. 1791's diamonds are all clarity graded at SI2 and above.
  • Diamond Colour: This will record the diamond's colour rating, from colourless (D-H) through to yellow (M-Z). At 1791, we use only D-Hgraded diamonds.
  • Diamond Carat Weight: This will record the precise carat weight (size) of the diamond.

Independent Diamond Grading Laboratories

We have made sure that your diamond will only be certified by an Independent Diamond Grading Laboratory. Independent laboratories only examine and grade diamonds, they do not sell them. Therefore, they will not make any diamond a better grade than it actually is - the certificate will be true to your stone.

Certificate The laboratories we use in New Zealand are:

  • Advanced Gem Lab, (AGL) - Auckland, New Zealand
  • GemLab - Auckland, New Zealand
  • Gemlink (DBL) - Christchurch and Wellington, New Zealand

The international laboratories that we use are:

  • GIA - The Gemological Institute of America
  • HRD - Hoge Raad Voor Diamant (HRRD)
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