brilliant
adjective
(of light or colour) very bright.
brilliant sunshine illuminated the scene
bright,shining,blazing,dazzling,light,vivid,intense,ablaze,beaming,gleaming,glaring,luminous,lustrous,luminescent,radiant,incandescent,phosphorescent,scintillating,resplendent,irradiant,lucent,effulgent,refulgent,fulgent,lucid,glistering,coruscating,lambent,fulgurant,fulgurating,fulgurous
noun
a diamond of brilliant cut.
an elegant necklace with four rows of brilliants