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).
Princess Shape, 0.67 Carat Diamond Size on Hand
The photo on this webpage shows the ballpark size of a 0.67 carat weight princess shape diamond on the thing that will ultimately be important - a female hand. If you search around on the web to find the actual size of a 0.67 carat weight princess shape diamond, you may notice the numbers will vary slightly - this is because the size (5.1 mm for this particular diamond) can depend on the cut, not just the carat weight.
Photos can sometimes be a little dependent on the viewer - I've tried to make this one as clear as possible, but don't forget seeing the stone in the flesh will give you a very different judgement of size to examining it on the internet. Fingers that are long and slender will change how a diamond looks as much as the carat size of the diamond - so look beyond just considering the 0.67 carat weight of this princess diamond.
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Diamonds are often magically "bigger" when you move them onto a woman's hand; because of this fact, make sure you ask a woman in the shop to put one on rather than putting it on your hand, which is probably much larger.
