Argyle Assets strictly source and transact graded and certified stones – a global gold standard.
The Gemological Institute of America (GIA), is the industry’s most trusted and most widely used gemological laboratory service. Headquartered in California, GIA has offices in many cities around the world, employing more than 1400 scientists, educators and certified diamond graders. Besides gem grading and certification, GIA also provides educational services and carries out intensive research work to keep up with fast changing technologies in the gemological field.
The American Gemological Society (AGS) laboratory is renowned for their scientific approach and research into diamond cut grading. Instead of using an alphabetical rating system like GIA uses, AGS uses a numerical scale of 0-10 for rating a diamond’s characteristics.
The chart illustrates the equivalent comparison between GIA and AGS across the three ’C’s’.
Argyle Grading & Certification
Argyle have developed their own colour grading system and after thoroughly assessing the diamonds they note three important factors to understanding the colour of pink diamonds: hue, tone and saturation.
Hue is the dominant colour of the diamond; tone is the amount of light or darkness in the diamond; and saturation is the strength of hue. The more intense the colour, the rarer and more valuable the diamond.
For fancy coloured diamonds, colour typically outweighs the other three & of clarity, cut and carat weight when it comes to grading and value, particularly in the case of Argyle pink diamonds, whose value increases along with the intensity of colour.
Fancy red is the most coveted colour and only a handful ever see the light of day. Less than 3% of all tender diamonds have received a Red GIA classification.