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Why concave facets?


#1
They are certainly lovely, but what specifically and technically do
they achieve over standard facets? 

Ann, Due to the curved nature of the cut surface, the gem material
acts as a lens, focusing the incoming light. This style is also
called OMF - Optically Magnified Faceting. The curved facets are
VERY bright.

Frank Romano
"Gemcutters are Multifaceted Individuals"
http://www.romanogems.com