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).
2.29 Carat Diamond Actual Size
This article gives a photo example presenting the actual size of a 2.29 carat diamond when set in a ring and put on a typical woman's hand. You can use the 8.6 mm mean diameter of a 2.29 carat diamond through measuring the length and width of your finger in order to get an appreciation of what a diamond of this size will look like on your finger. You should be aware that photo like this one are limited in what they can show - women's hand sizes will vary quite a bit.
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The apparent size of the diamond and ring can be affected by whether you have thin or thick digits, and also depends on the length of your fingers.