Jewellery Stories
By Niki Bruce
20 Jul 2020

A useful guide to common Diamond terms 

useful guide to every common Diamond terms GIA RINGS

Image courtesy

Many of us have been bewildered by the numerous diamond terms used to describe the characteristics of the gemstone. It is a good idea to acquaint yourself with the seemingly confusing and never-ending list of jargon before venturing on a diamond shopping trip. The most helpful thing for you will be being well-prepared and informed.  

The indispensable 4Cs

useful guide to every common Diamond terms GIA 4CS

Image courtesy

The four crucial ‘Cs’ refer to a diamond’s cut, its apparent colour, the stone’s carat weight, and the diamond’s overall clarity. These four factors come together to determine the quality of a diamond. Created by GIA and used globally as the fundamental qualitative attributes of diamonds, the 4Cs help sellers and buyers communicate in a universal language. The 4Cs help you understand the precise traits of the particular diamond you are investing in.


useful guide to every common Diamond term BRACELET

One of the most common diamond terms is Brilliance, and it is the “make or break” factor when it comes to buying a diamond. The diamond gemstone is all about its sparkle. The shape of the stone along with the presence of multiple facets or the flat surfaces on diamond decide the final glimmer of the diamond. Higher number of facets lead to a more enhanced brilliance. Consider the round-brilliant cut diamond featuring an extravagant 58 facets or the glorious princess-cut diamond with  50 facets – both these specimens belong to the haloed family of highest sold and very expensive diamonds.


useful guide to every common Diamond terms GIA CUT DIAMOND

Image courtesy

Symmetry, just like the term suggests, refers to a diamond’s preciseness of shape and uniform placement and proportional arrangement of its facets. The superlative quality of symmetry is categorically described and rated as “Excellent”, “Very Good”, “Good”, “Fair” and followed by “Poor”. Excellent symmetry encompasses the superiority of a diamond as it is virtually impossible to discern any flaw with naked eye. On the other hand, poor symmetry represents the imperfection of a diamond which can be easily identified even with naked eye and zero magnification.

Inclusions and Diamond’s Clarity

useful guide to every common Diamond term NECKLACE

Another one of the common diamond terms, Inclusions refer to the naturally occurring blemishes and fissures within a diamond. The comprehensive clarity of a diamond is demonstrated by the intensity and number of inclusions present within. However, in most cases, the clarity of a diamond usually does not get marred by the presence of inclusions as most of these imperfections are unthinkably tiny to be deciphered by naked eyes. The GIA clarity scale measures diamonds on its overall clarity based on the presence or rather absence of  inclusions with the scale varying from Included (I1 to I3) to Flawless (FL) with multiple levels between these extremes.

The bow-tie effect

The dreadful bow-tie effect is a diamond term you want to avoid in a diamond. The dark “bow-tie” occurs when a specific cut of a diamond fails to reflect light from its centre and in the process creates a bow-tie shaped zone of unsightly darkness. Diamonds with an oval shape, a Marquise cut, or the pear shape generally exhibit this tendency as the evidence of incompetent cut quality. A bow-tie effect can be best diagnosed when you inspect the diamond physically and not just rely on the metrics detailed in the certificate.

useful guide to every common Diamond term EARRINGS

These diamond terms help buyers to understand the integral qualities of the diamond jewellery they are investing in.

To get personalised help to choose the right diamond, call us on +65 6733 4100, or send us an email at Our atelier is open to customers, or we can organise a virtual appointment if you prefer. 

Discover our fabulous Classic Diamonds collection, and our stunning Designer Diamonds collection.

Open chat
Hi. This is Vinod.

Please allow me to help, via this chat, with any information about our products and services or to set an appointment.

Alternatively, feel free to call on +65 67334100 or email to