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).
0.66 Carat Diamonds
In looking at the 5.67 mm width of a 0.66 carat diamond, remember that this width can vary quite a bit depending on the depth of the diamond. One thing to consider that may stop you overspending on a diamond is how large the diamond will appear when it is finally placed on the woman's hand. Often the buyer of the diamond is happily surprised by how large the diamond appears when it is finally placed on the hand.
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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. There are no firm statistics that are universally applicable, but it is generally agreed that the average size of a diamond is around a third of the carat, perhaps a little more.
Depending on personal preference, people may choose to get a smaller diamond in order to get a higher colour grade, such as d, e or f. It's heartening to know (if you're a billionaire) that there are actually very large diamonds which are colourless, such as the centenary diamond, which is a grade d colour diamond that comes in at the whopping weight of 273 carats.
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.
The story of Harold Ross, the New Yorker and me is a mere footnote to the story of our time, and we might as well face the truth that to researchers of the future, poking about among the ruins of time, we shall all be tiny glitters. But then, so are diamonds. James Thurber .