Diamonds are what Crowley's is known for!

We believe that every diamond is as unique as the person who wears it. A diamond should reflect your personality. Your choice of a diamond makes a public statement about your loved one, and about your relationship, every time the diamond is worn.

The 4 Cs - Cut, Colour, Clarity, Carat

Diamonds are graded based on four different aspects: cut, colour, clarity and carat. These are commonly known as the "Four C's". Our in-store Graduate Gemologist grades our diamonds, and we also have access to a huge array of diamonds that are accompanied by a certificate that describes the stone's clarity, colour and cut in detail. When you look for loose diamonds, you will encounter different certificates, like "GIA" (Gemological Institute of America) or "AGS" (American Gem Society). The GIA is the non-profit educational institution that created the world's grading system for diamonds. The GIA and AGS provide the leading certificates in the industry, and give you a very detailed snapshot of all the dimensions, details and qualities of your stone.





The cut of a diamond — its roundness, depth and width, and uniformity of the facets — determines a diamond's brilliance. Many gemologists consider cut the most important diamond characteristic because even if a diamond has perfect colour and clarity, a diamond with a poor cut will have dulled brilliance. It can easily account for 50% of the price of the diamond.

The width and depth have the greatest effect on how light travels within the diamond, and how it exits in the form of brilliance. The diamond's proportions, specifically the depth compared to the diameter, and the diameter of the table compared to the diameter of the diamond, determine how well light will reflect and refract within the diamond.

Ideal cut: Represents roughly the top 3% of diamond quality. Reflects nearly all light that enters the diamond. An exquisite and rare cut.

Very good cut: Represents roughly the top 15% of diamond quality. Reflects nearly as much light as the ideal cut, but for a lower price.

Good cut: Represents roughly the top 25% of diamond quality. Reflects most light that enters. Much less expensive than a very good cut.

Fair cut: Represents roughly the top 35% of diamond quality. Still a valuable diamond, but a fair cut will not be as brilliant as a good cut.

Crowley’s Jewellers & Goldsmiths carries a huge selection of diamonds. You'll find no diamonds with cut grades lower than fair, which are too shallow or deep to present an acceptable amount of brilliance.


A diamond works like a prism, dividing light into a spectrum of colours. The colours reflect in vivid flashes called "fire." Natural pigmentation in a diamond acts like a filter and diminishes the fire. The less colour in a diamond, the more varied the fire, and the better the colour grade. 


*** Related to, but not affecting diamond colour, fluorescence is a unique effect that causes a diamond to produce a slight blue glow when exposed to intense, direct ultraviolet light. Some people seek diamonds that produce this unique effect, while others definitely avoid it — it's purely a matter of taste.


Diamonds that are absolutely clear are the most sought-after and therefore the most expensive. But virtually all diamonds have inclusions — scratches, trace minerals or other tiny characteristics that can detract from the pure beauty of the diamond, depending on how easily they can be detected.


Once you've determined what cut, colour, and clarity grades you're looking for in a diamond, it's easy to determine the carat weight that will fit within your budget. Large gems are discovered much less frequently than small ones. Large diamonds are therefore much more valuable. In fact, diamond prices rise exponentially with carat weight. A one carat diamond of any given quality is always worth more than two ½ carat diamonds of the same quality.

To choose the best carat weight, consider her style, the size of her finger, the style and size of your setting, and your budget. If you have a set budget, explore all your options and you'll find that there is a wide range of diamond carat weights and qualities available in your price range. If a large carat weight is important to you but you're working within a budget, consider a diamond with a good cut, SI2–I1 clarity, and an H or I colour grade.

For ideas and suggestions on how to choose the right engagement ring, drop into our store and spend some time with one of our diamond specialists.