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).

Actual Diamond Sizes of a 0.39 Carat Diamond

If you're wondering how large a diamond with a 0.39 carat weight appears when worn, take a look at this picture which provides a visual guide to this diamond's size. This 0.39 carat diamond (round shape) is 4.8 mm in diameter as shown in the picture.

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This picture displays a size L 1/2 ring (British and Australia), which is the same as a US size 6 . The hand of the woman pictured has quite long and slender fingers - your fingers may or may not be similar - if your fingers are differently shaped, be aware that a diamond engagement ring may present quite differently on your finger. The ratio of your ring finger's length and its width can play an important role in the final appearance of a diamond on your hand.

Go searching for diamonds this size at James Allen by clicking on the banner below and dragging the carat slider to the appropriate setting:

Actual Diamond Photos from JamesAllen