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).
2.08 Carat Diamonds
The width of a diamond with a weight of 2.08 carats is about 8.36 mm.
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Some online retailers provide, amongst other diamond properties, a property called the cost per carat, which gives consumers another way of thinking about the value of a diamond. Girdle thickness is a diamond property which many people never even think about, but which can critically affect how big the diamond appears to be.
Diamonds with a size of 2.08 carats are aplenty, but diamonds with a size of 2.08 carats and all the other desirable properties of the diamond are not so common - so don't forget to think about these other properties. A half carat diamond is a typical size for the average diamond engagement ring, but of course sizes can vary hugely between couples, depending on economic status and personal preference.
Don't mix up carat weights of single diamonds with total diamond weights - the mean very different things and mixing them up can trick you when you're considering different prices. 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.
There are three things extremely hard: steel, a diamond, and to know one's self. Benjamin Franklin .