Light Performance - What is Brilliance?.

Since the mid-20th century, the 4Cs have been the global standard-bearer of a diamond’s beauty, rarity, and value. Most consumers seriously looking to buy a diamond will have come across the concept of the 4Cs and will use these gradings as a guide to help them in the purchasing process.

Of course, with the explosion of online information, there is more than ever to read and research about the 4Cs. When was the last time you Googled “how to choose a diamond”? This simple online search will return a quarter of a billion results.

With so much information available at the click of the mouse, it is natural to assume that today’s customers are better informed and have deeper knowledge about the diamond and the 4Cs gradings. However, that doesn’t seem to be the case. Head to Google again and search for “trust among diamond consumers”. You’ll get over 20 million results. Consumer trust in the diamond industry is still an issue of concern, even today. More information doesn’t necessarily translate to better knowledge and better decision making. That’s why diamond retailers need to find ways to help their customers comprehend a diamond’s true beauty and character. And that’s where light performance can be a lifesaver on the sales floor.


Light Performance: A New and Better Way to Assess a Diamond

Unlike other gemstones, a diamond’s appearance is a direct result of the way it interacts with light. When light enters a diamond, it bends and refracts. It then exits the diamond and returns to the eye of the viewer. Every diamond interacts with light in a different way, due to the size, type, and location of its unique birthmarks (its inclusions and flaws), and the way it was cut and polished. Therefore, no two diamonds will have the same light performance.

The 4Cs grading standard covers just four aspects of a diamond: carat weight, color, cut and clarity. These can’t properly assess a diamond’s unique appearance, because they don’t address the one thing that matters most: the diamond’s individual play with light. That is why two diamonds that have the same or similar 4Cs gradings, can have a completely different appearance in the light, and consequently, a (sometimes even significant) gap in pricing.