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).
0.12 Carat Weight Princess Diamond Shown on a Hand
This article gives you an idea of how big a 0.12 carat weight princess shape stone will look when viewed on a typical hand of a woman. The precise size of a 0.12 carat size princess shape diamond depends on other factors such as cut, but is usually in the ballpark of around 2.7 mm along one of the straight edges of the diamond. Digits can be all different sizes, which should factor in to your decision about what shape and size of diamond to get.
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Later after the diamond is purchased, it's likely you might be pleasantly surprised because the diamond appears larger on a woman's hand than you first thought, compared with when seen in isolation.