By thoroughly studying the refractivity of a stone, you should be able to determine if it is accurate or phony. Glass and quartz sparkle less because of their lower refractive index.Ī stone’s brilliance is impossible to change, even with an experienced cut, because it is an inherent feature of the stone. Diamonds refract or bend the light that passes through them, giving them their sparkling appearance. What Light Makes Diamonds Sparkle Most?Įxamine the stone’s refractivity.Similarly, the quality of synthetic diamonds has substantially increased over the years, which means that this may mislead a diamond beginner.Īs a follow-up, we would have to add that diamond formation occurs only below the oldest continents that have been stable for billions of years these locations are known as cratons. This test works better with a point of reference For example, if you have cubic zirconia that you can compare to the diamond, you will be able to determine the significant differences between them.Ī poorly cut diamond that is extensively included and has a low color grading will not provide the unique brilliance that one expects from a diamond, making it difficult for the untrained eye to discern these optical features. We desire diamonds for these qualities, and taking the time to investigate this will give you a wealth of knowledge about the stone. Then see how the light reflects off it.Īsk yourself two following questions: Does the diamond have a white, flickering quality ( scintillation)? Are there any rainbow light reflections? Place the diamond in front of a light source – such as a lamp. (A lab-grown diamond will be identical to a mined diamond.) This is marketed as an excellent way to obtain a better knowledge of a diamond’s optical qualities and to determine whether the diamond is a real, natural diamond. The sparkle test is a “by eye” method of evaluating your diamond.
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