Welcome to Gem Dictionary by The Gem Academy where we explain terminology used for gemstones. Let’s learn about ‘brilliance’…
Brilliance is an optical effect caused by light totally internally reflecting (TIR) off the pavilion (back) facets of a facetted gemstone. It specifically refers to the return of white light.
Like with fire, many factors affect the amount of brilliance seen in a gemstone.
- The refractive index (RI) of the gem (the higher the RI, the more easily TIR can be obtained through cutting to specific proportions. The brilliance is seen from more angles that directly face-on).
- Cut shape
- Cut quality – particularly proportions, but symmetry and polish quality can also have an affect
- Clarity of a gem (as inclusions can interrupt the pathways of light)
- Cleanliness of a gem (grease on the surface can affect the stone RI differential reducing TIR)
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This video was written, produced, and edited by Julia Griffith FGA DGA EG of The Gem Academy. Fellow gemmologist and industry friend :)
