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).
Diamond Size on Hand of a 1.42 Carat Diamond
This 1.42 diamond will look about the size indicated in the photo, on an average-sized woman's finger. An average round diamond with a 1.42 carat size has a width of 7.3 mm, although this can change if the cut is shallow or deep.
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The ring shown in the image is a typical size six ring; of course, the ring you get could be much larger or smaller than this one. You should be aware that illustration like this one are just that - only illustrative - female hand sizes will vary quite a bit. Also take into account the width and overall length of your fingers. Try and avoid making the mistake I made of looking at a potential diamond engagement ring placed on my own, male finger - remember that it is going to go on a usually smaller and more delicate female hand, which will make the diamond appear significantly larger.