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emerald cut
octagonal step cut, the classic cut for emeralds to avoid any damageable sharp edges

epiasterism
when the star is best visible in reflected light, example: star sapphire
also see asterism
opposite of diasterism

euhedral
well-formed, external crystal faces well developed, opposite of anhedral

eyeclean
when a trained expert cannot see any inclusions with the unaided eye

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