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Diamond proportions and facets, for the round brilliant cut. The original 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 Tolkowsky's original design) are cut from the ideal brilliant.
Diamond proportions and facets, for the round brilliant cut. The modern round brilliant (Figure 1 and 2) consists of 58 facets (or 57 if the culet is excluded); 33 on the crown (the top half above the middle or girdle of the stone) and 25 on the pavilion (the lower half below the girdle). The girdle may be frosted, polished smooth, or faceted.
The depth percentage is the overall quickest indication of the quality of the cut of a round brilliant. "Ideal" round brilliant diamonds should not have a depth percentage greater than 62.5%. Another quick indication is the overall diameter. Typically a round brilliant 1.0-carat (200 mg) diamond should have a diameter of about 6.5 mm (0.26 in).
For a more fashion-forward piece, this diamond ring includes a thick 18k yellow gold band with a “floating” ring of baguette-cut diamonds above it. $1,990 at Brilliant Earth Shane Co.
By adding facets on the outside of the diamond, the Royal Asscher Round Brilliant Cut removes some of the darker elements seen in a traditional round diamond, even an ideal cut. The effect is a crisp, clear centre, which though true to the round diamond shape is distinctively different with 74 facets compared to the generic diamond's 58.
Dousset attests to the staying power of round-cut diamonds, but says that oval shapes add a flattering, elongated look while maintaining the brilliancy of the round-cut diamond. Shop Oval Cuts ...
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