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).
0.28 Carat Actual Size (Princess Shape)
This page gives you some concept of how large a 0.28 carat size princess shape diamond will look when viewed on the hand of a woman. The precise size of a 0.28 carat weight princess shape diamond will vary depending on the depth of cut, but is usually in the ballpark of around 3.9 mm along one square edge. While this picture will give you some concept of how big a diamond will appear viewed on the female hand, remember that the size of the ring you pick or need could be quite different in size to that shown in this image.
Fingers can be all different sizes, which should influence your decision about what shape and size of diamond to get.
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There's no need to freak out if diamonds and the costs are getting you down - because the diamond will appear larger on her hand, you may not need to spend as much to get your desired effect.