FIELD: jewelry industry, in particular, diamond processing. SUBSTANCE: precious stone, in particular, diamond with rounded facets has 57 faces and is composed of rundist, lower part with faces arranged in two stages at an angle to rundist surface, upper part with faces arranged in three stages at an angle to rundist surface, and platform. Faces of lower part are inclined at an angle of 47-52 deg to rundist surface and faces of upper part are inclined at an angle of 5-17 deg to rundist surface. Platform has size making 0.05-0.85 the diameter of precious stone. EFFECT: increased correlated coefficient of diamond glare beauty and greater yield during manufacture of diamonds from octahedral habitus raw material. 3 dwg, 28 tbl
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