1) Brightness 2) Brillance 3) Eclat 4) Luster 5) Splendor 6) Splendour 1) Brightness 2) Brilliance 3) Luster 4) Lustre 5) Splendor 6) Splendour 
The total amount of white light returned to the viewerby a gem. This includes internal and external reflections.
Bril'lian·cy (brĭl'y a n*sȳ) noun [ See Brilliant .] The quality of being brilliant; splendor; glitter; great brightness, whether in a literal or figurative sense. « With many readers brilliancy of style passes for affluence of thought. Longfellow. ...
Property (of a beer) of being transparent and sparkling.
splendor noun a quality that outshines the usual
an instance of brilliance: the brilliancies of Congreve's wit. · brilliance.