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 Size of a 0.66 Carat Princess Shape Diamond
The image shown on this webpage illustrates the ballpark size of a 0.66 carat weight princess shape diamond on the thing that will ultimately be important - a female hand. Carat weight isn't the be all and end all - the type of cut will also affect the apparent size of the diamond; a diamond like this 0.66 carat one will usually be around 5.1 mm typically. Some advice for how to use the information on this page is to initially narrow down your size range; then you can go into stores and try diamonds out in person, armed with this prior knowledge.
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The visual size for this 0.66 carat princess diamond will be affected not only by the carat weight but also on the width to length ratio of the finger the diamond ends up on.
