Quick and Easy Buying Guide
Carat weight: 1 carat = 200 milligrams = 6.5 mm diameter. Doubling weight doesn't double diameter.
Diamond clarity: FL/IF/VVS/VS = super expensive, near perfect. SI = best value if you can check a photo for obvious inclusions (defects).
Color: D-G = colorless, expensive, only if you have money to burn. H-J = best value. Can go lower in gold metal settings than white metal.
Cut: Better cut ratings let more light into a diamond, making it sparkle more. Very important property, don't skimp here.
Set a budget and minimum cut (Premium). Go J color for gold and I/H for white metals. Go searching for SI1/SI2 clarity diamonds at James Allen. Pick a diamond with small/no inclusions. Choose a ring setting and buy it risk-free (60-day returns).
0.40 Carat Princess Shape Diamond Actual Size
Carat weight doesn't mean much until you see it in person - this article uses a hand as "context" for the apparent size of a 0.40 carat size diamond of princess shape. The precise size of a 0.40 carat size princess shape diamond will vary depending on the depth of cut, but is usually in the ballpark of around 4.5 mm along one of the straight edges of the diamond. The illustration in this page shows an L 1/2 ring size, which is typical or perhaps on the small side of typical for a female ring.
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Fingers that are long and slender will affect how a diamond looks as much as the carat size of the diamond - so consider other factors as well as the 0.40 carat weight of this princess diamond.
