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).
2.07 Carat Weight Princess Diamond Shown on a Hand
This page includes a useful picture showing you the apparent size of a 2.07 carat weight princess shape diamond, when it's actually on a typical woman's hand. If you search around on the web to find the actual size of a 2.07 carat weight princess shape diamond, you may notice the numbers will vary slightly - this is because the size (7.8 mm for this particular diamond) depends on things like cut as well. To give you more of an idea of what the picture is showing, the ring shown is a US size 6, which is the same as an L 1/2 ring size in Britain or Australia.
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The size of a female hand vary a lot between women - just look around you when you're next in public - so this picture can only show the apparent diamond size for a typical size ring.