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).
1.64 Carat Diamond Actual Size
This page gives an illustrated example presenting the real size of a 1.64 carat diamond when set in a ring and put on a typical woman's hand. I have used the most common engagement ring size, which is size 6, in the image, which has an internal diameter of 0.65 inches of 16.5 mm. The hand of the woman pictured has quite long and slender fingers - your fingers may or may not be similar - if they're not, bear in mind that a diamond engagement ring may present quite differently on your finger. You also have to take into account the width and overall length of your fingers.
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Go searching for diamonds this size at James Allen by clicking on the banner below and dragging the carat slider to the appropriate setting:
