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0.54 carats, GIA certified E colour and SI1 clarity, set on a slim band of 18K white gold.
Two half-carat diamonds of identical weight and grade can differ by nearly half a millimetre across the top, and the certificate will not put that in a headline. Carat measures mass. Where that mass sits is decided by the cutter, and a stone cut deep hides weight in its pavilion where nobody sees it, while a stone cut shallow spreads it across the table where everybody does.
The number to look for is the diameter, printed in the measurements line of every report. A well-proportioned 0.50 ct round measures about 5.1 mm; the same weight cut steeply can come in at 4.9, and cut too flat can reach 5.4 while losing brightness through the bottom. Two of those three are worth buying and they are not the extremes.
This stone is 0.54 carats with E colour — second on the colourless scale — and SI1 clarity, which keeps the inclusions at ten-power magnification and out of view.
Same price, yellow gold: 0.52 ct F SI1. Same price, twisted shank: 0.51 ct E VS2.
