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).
2.83 Carat Diamonds
If you're interested in the normal metric weight of a 2.83 carat diamond, it is 566 mg.
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A diamond that is sized at 2.83 carats is usually roughly 9.27 mm in the width dimension.
2.83 carats doesn't always get you a diamond which is precisely 9.27 mm in width - because the diamond could have been cut in different ways, it may have a different width. A shop assistant may show you a one carat diamond and a one carat emerald stone next to each other, and point out how much larger the emerald stone is. This is because emerald is a much lighter material, so for a given weight of it, it will appear much bigger than for an equivalent sized diamond.
Performance stands out like a ton of diamonds. Non performance can always be explained away. Harold S. Geneen .
You shouldn't really worry about this, but the average size of a diamond in a diamond engagement ring, at least within the united states, is about half a carat.
If you're in a diamond store and you see a diamond with its carat weight marked and it looks wrong, don't hesitate to ask, and walk away if they won't give you a straight answer.
First-time diamond buyers who are in a hurry often just focus on the diamond carat size, which is a big mistake - other properties such as the clarity of the diamond are important in getting a diamond which is attractive not just in terms of its size, but also its appearance.