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).
2.27 Carat Diamond Sizes on Hand
This article gives an illustrated example of the real size of a 2.27 carat diamond when set in a ring and put on a typical woman's hand. If you are hesitant to put too much stock in a simple picture, what you can do is measure the size of your finger and compare it with the 8.6 mm mean diameter of a 2.27 carat diamond. The ring shown in the picture is a US size 6; this is the same as an L 1/2 size in countries like Australia and Britain, and is an average ring size. Be aware that picture such as this one are just that - only illustrative - female hand sizes will vary quite a bit. The ratio between your ring finger's length and its width will play a pivotal role in the final appearance of a diamond on your hand.
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If you are stressed about how expensive diamonds are but are still really set on getting one, here's something to cheer you up - the diamonds often look bigger when put on a hand, especially in cases where her hand is on the smaller side.