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 on Hand of a 1.51 Carat Diamond
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 7.5 mm average diameter of a 1.51 carat diamond. The ring shown in the image is a typical size 6 ring, but bear in mind the ring you get could be significantly larger or smaller. You should be aware that image like this one are limited in what they can show - women's hand sizes will vary quite a bit. Don't forget to take into account not just the size of your hand as a whole, but also if you have long and slim fingers or squatter ones.
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Try and avoid making the mistake I made of looking at a potential diamond engagement ring placed on my own, male finger - remember it's going to go on a generally smaller and more petite female hand, where it will likely not shrink quite as much as when placed on a male 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:
