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 0.09 Carat Princess Shape Diamond
Carat weight doesn't mean a lot until you witness it in person - this article provides a human hand as "context" for the apparent size of a 0.09 carat weight diamond with a princess shape. The exact size of a 0.09 carat size princess shape diamond depends on other factors such as cut, but is usually in the ballpark of around 2.4 mm along one square edge. If you have got a ring in your possession and you know the size, you can compare it to the US size six ring pictured - this will help you get a concrete idea of the diamond size shown in the photo.
Some advice for how to use the information on this page is to initially narrow down your size range, and then to go into stores and actually try a few different sized princess shape diamond rings on, armed with this prior knowledge.
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Digits can be all different sizes, which should influence your decision about what shape and size of diamond to get.
Diamonds are often magically "bigger" when you move them onto a woman's hand - so try to get a woman in the shop to put one on instead of putting it on your own male hand.
