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 Size of 0.40 Carat Diamond

This page gives an illustrated example presenting the real size of a 0.40 carat diamond when set in a ring and put on a typical woman's hand. This image shows a size L 1/2 ring (Britain and other countries ), which is equivalent to a US size 6 .

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It is good to be cautious when looking at a picture - a picture alone won't be entirely representative of all finger and hand types - you are best off getting an idea in store by trying on actual rings with your partner. The visual size of the diamond and ring will vary depending on whether you have thin or thick fingers, as well as by their length.

Don't make the mistake I made of examing a potential diamond engagement ring placed on my own, male finger - remember that it is going to go on a usually smaller and more petite female hand, which will make the diamond appear significantly larger.

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