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).
0.71 Carat Diamonds
A way of using numbers to help you compare diamonds is to calculate the cost per carat of diamond. Diamond carat size doesn't narrow down your list of diamonds very much, what you really need to do is consider what the other desirable properties of the diamond, decide how good these properties have to be for your situation, and then search for diamonds which meet all of these property requirements at the same time.
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Let us not be too particular; it is better to have old secondhand diamonds than none at all. Mark Twain .
Ruby and sapphire are two gemstones which are significantly denser than diamond, which is why a one carat ruby or sapphire will generally looks smaller than a one carat diamond, if you've ever been confused in a store.
People say the four cs for a reason - diamond carat size is just one of the four cs and the others are arguably just as important in determining how 'attractive' and 'good' a diamond is.