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).
1.05 Carat Princess Shape Diamond Actual Size
Carat weight doesn't mean a lot until you witness it in context - this article uses a hand as "context" for the apparent size of a 1.05 carat weight diamond of princess shape. If you've got a ring in your possession and you know what it's size is, use it to compare with the US size 6 ring pictured - this will assist you in getting a better idea of the diamond size in the picture. 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 actually try a few different sized princess shape diamond rings on, armed with this prior knowledge.
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The visual size for this 1.05 carat weight princess diamond will depend not just on the carat weight but also on the width to length ratio of the finger the diamond ends up on. If you're a male trying to calculate the appropriate diamond size to get your other half, remember that the diamond will invariably look a lot bigger on the hands of a woman, which are typically smaller.