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How to choose the perfect diamond: Top 4 tips you need to know

diamonds on turquoise background

Whether you’re buying an engagement ring or choosing a pair of diamond earrings, purchasing a diamond is a decision you don’t want to rush into. In fact, before you start looking for that special stone, you may want to invest a little time to learn more about diamonds and how to protect them.

Below are a few tips you’ll need to know before buying a diamond:


  1. Get to know the four Cs.

    A diamond’s quality is measured by the four Cs: cut, colour, clarity, and carat. Which is the most important and why?

    • Cut is the most important characteristic to consider when selecting a diamond because it has the most impact on the diamond’s brightness and scintillation or sparkle. When a diamond is cut to proper proportions, this will maximize how the light bounces back to produce the sparkle we want. Even a diamond with perfect clarity and colour will appear dull if the cut isn’t right.
    • Colour is the next most important characteristic of the four Cs. In this instance, colour refers to the lack of colour. In other words, the less colour, the more valuable the diamond. Truly colourless diamonds are very rare, and colour distinctions can be subtle and only visible to the trained eye. That’s why you should refer to the GIA colour scale, which uses letters starting with D for colourless through to Z for light yellow, brown, or grey stones, to indicate the diamond’s colour. Once the colour grade is beyond the letter M, the light yellow, brown or grey colour becomes visible to the naked eye.
    • Clarity refers to imperfections or flaws on the surface or inside the stones, which can be microscopic in nature and nearly impossible to see to the naked eye. While diamonds with the least blemishes and inclusions receive the highest grading, those flaws may not affect the diamond’s overall appearance and beauty.
    • Carat refers to the diamond’s weight, not its size. In fact, a diamond with a high carat and a poor cut will look smaller than one with a lower carat and a high-quality cut. To help maximize your budget, look for diamonds with a carat weight that is just below a standard size, for example, search for a 1.9 carat diamond rather than a 2.0 carat. You’ll save money and will not visibly notice the difference in the size of the stone.
  2. Team up with a quality jeweller.

    When choosing a jeweller, be selective, find someone with GIA Graduate Gemologist credentials, who is affiliated with jewellery industry groups and professional associations. If you need help selecting a jeweller to work with, contact your independent insurance broker.

  3. Request a grading report.

    For an unbiased assessment of a diamond’s quality, ask your jeweller for a diamond grading report. It will document the specific characteristics of the diamond, including the four Cs, confirmation that the stone is natural or lab-grown, and will disclose any treatments or alterations the diamond has undergone to change its colour or clarity. The Gemological Institute of America (GIA) is the most widely used service and sets consistent standards for diamond grading and identification, so look for a GIA Diamond Grading Report.

  4. Protect your purchase.

    Make sure to have your jewellery appraised and insured. Look for a Valuable Articles insurance policy that provides all-risk, worldwide coverage, including mysterious disappearance and automatic protection for newly acquired items. Periodically have your jewellery reappraised to be sure your insurance is updated and reflects current values. Consult with your jeweller on an annual basis to have your item professionally cleaned and condition checked for any loose prongs or clasps.

This document is advisory in nature and is offered as a resource to be used together with your professional insurance advisors in maintaining a loss prevention program. It is an overview only, and is not intended as a substitute for consultation with your insurance broker, or for legal, engineering or other professional advice.

Chubb is the marketing name used to refer to subsidiaries of Chubb Limited providing insurance and related services. For a list of these subsidiaries, please visit our website at Insurance provided by Chubb Insurance Company of Canada or Chubb Life Insurance Company of Canada (collectively, “Chubb Canada”). All products may not be available in all provinces or territories. This communication contains product summaries only. Coverage is subject to the language of the policies as actually issued. 

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