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Diamond proportions and facets, for the round brilliant cut. The modern round brilliant-cut was developed by Marcel Tolkowsky in 1919. The ideal proportions are 100% diameter, 53% table, 43.1% pavilion and 16.2% crown. The girdle and culet (if any—not part of
Oval Cut: Unique and Classic. Oval diamond engagement rings offer a distinctive twist to a classic Round. They're ideal for distinguished, creative people who elegantly stand out from the crowd.
A diamond cut is a style or design guide used when shaping a diamond for polishing such as the brilliant cut. Cut refers to shape (pear, oval), and also the symmetry, proportioning and polish of a diamond. The cut of a diamond greatly affects a diamond's brilliance—a poorly-cut diamond is less luminous.
Also known as girdle fencing or "dig marks", this is caused around the diamond's girdle as the diamond is cut or bruted. These fine lines usually resemble a strand of hair and do not present a problem. However, extensive bearding can lessen the brightness of the diamond. It is suitable that such diamonds be cut or polished again to improve luster.
Princess cut diamond set in a ring. The princess cut (technical name 'square modified brilliant') is a diamond cut shape often used in engagement rings. The name dates back to the 1960s, while the princess cut as it exists was created by Betazel Ambar, Ygal Perlman, and Israel Itzkowitz in 1980.
Diamond earrings with culets clearly visible through the stones Diamond proportions and facets, for the round brilliant cut In gemology , a culet is a flat face on the bottom of a gemstone . During the 14th century, after the adoption of the table cut , a further facet was added to the bottom of the cut parallel to the surface of the table.