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).
1.41 Carat Diamonds
What many people don't realise is that a 7.33 mm wide diamond can be a range of weights, not just exactly 5 carats, because the diamond can vary in depth. God forbid that this should be a problem for anyone, but it may be that the diamond, once it actually put on the fiance's hand, may appear to be too big and unwieldy. Make sure to take this into account when you're shopping around.
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Professional critics are incapable of distinguishing and appreciating either diamonds in the rough or gold in bars. They are traders, and in literature know only the coins that are current. Their critical lab has scales and weights, but neither crucible or touchstone. Joseph Joubert .
Carat size is only one that property out of a number that you should be considering. You should also consider a diamond other properties such as cut, because this will have a drastic effect on how well the diamond sparkles.