Gemex System is well regarded in the diamond industry for their cutting edge Light Performance Analysis since 1988. The GemEx BrillianceScope Viewer uses patented spectrophotometer technology to measure a diamond's light performance. It then compares it to a vast, millions-strong database of other diamonds of the same shape. Unlike the 4Cs, which focus primarily on a diamond’s rarity, the GemEx BrillianceScope directly measures a diamond’s light performance.