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Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]
Figures 1 and 2 show the facets of a round brilliant diamond. Figure 1 assumes that the "thick part of the girdle" is the same thickness at all 16 "thick parts". It does not consider the effects of indexed upper girdle facets. Figure 2 is adapted from Figure 37 of Marcel Tolkowsky's Diamond Design, [2] which was originally published in 1919 ...
The diamond size is ~ 2 mm. Pure diamonds, before and after irradiation and annealing. Clockwise from left bottom: 1) initial ( 2 mm × 2 mm ); 2–4) irradiated by different doses of 2 MeV electrons; 5–6) irradiated by different doses and annealed at 800 °C .
Paysanne; 1 ⁄ 2 by 1 ⁄ 2 by 1 ⁄ 8 inch (10 mm × 10 mm × 3 mm) Lozenge; diamond shape, 1 ⁄ 2 by 1 ⁄ 2 by 1 ⁄ 8 inch (10 mm × 10 mm × 3 mm) Fermière; cut lengthwise and then sliced to desired thickness 1 ⁄ 8 – 1 ⁄ 2 inch (3–10 mm) Rondelle; cylindrical vegetables cut to discs of desired thickness 1 ⁄ 8 – 1 ⁄ 2 inch ...
"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).
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