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).
1.90 Carat Diamonds
Each point in a diamond's weight is worth 2 mg, so a 190 points diamond weighs 380 mg.
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A 1.90 carat diamond is about 8.11 mm this in size. 1.90 carats specifies a certain size of diamond, but what about all the other properties of the diamond? Seasoned diamond buyers make sure to pay attention to all the properties of the diamond when the searching for that perfect stone, in order to make a balanced purchase which isn't just dominated by size considerations.
No pressure, no diamonds. Thomas Carlyle .
There's a lot of hearsay on the internet about the average size of a diamond used in a typical diamond engagement ring - it's around half carat - but that of course doesn't give you any information about the typical clarity or colour of the diamond, and that in itself should tell you how useless that statistic is in isolation. It's interesting to note that while the small carat diamond (by small i mean one or two carats) may have only been discovered relatively recently, many of the spectacular large diamonds were found many hundreds of years ago, such as the regent diamond of france which was used by two of the king louis's, with a mighty size of 140 carats.
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.
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.