Other diamond properties to consider


Facets are the flat polished surfaces cut on the surface of a diamond. A Modern Round Brilliant Cut (Round) diamond has 58 facets  as we can see from this diagram;


Fluorescence is a form of luminescence widely misunderstood amongst both Australian Jewellery retailers and consumers who have a perception that it is somehow negative when it usually has no effect or even a slightly positive one. The Oxford Dictionary is “the property absorbing light of short wavelength and emitting a light of longer wavelength”. Fluorescence  can best be seen in ultraviolet light but how much it effects the brilliance of a diamond under normal lighting conditions is the subject of much debate.

The GIA says this of Fluoescence;

“Fluorescence is a common phenomenon in diamond. Of all the diamonds submitted to GIA over the past decade, approximately 25% to 35% exhibit some degree of fluorescence. And of those, only 10% show strengths of fluorescence in the medium, strong, or very strong categories.

GIA studies have shown that the strength of fluorescence has no widely noticeable effect on a colorless or near-colorless diamond’s appearance. In fact, many prefer the appearance of diamonds that have medium to strong fluorescence. In very rare cases (fewer than 0.2% of the fluorescent diamonds submitted to GIA), some diamonds with extremely strong blue fluorescence may appear hazy or oily.”


The shape of a diamond is not to be confused with the cut which is how well the diamond is cut regardless of its shape. Shapes other than Round Brilliant diamonds are often referred to as “Fancy Cut” Diamonds.

Here is a handy chart of some of the diamond shapes available;