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).
1.83 Carat Diamonds
A 1.83 carat diamond is also described as a 183 point diamond.
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To convert the weight of this diamond in carats to milligrams, you multiply the number of carats by 200, in this case multiplying 1.83 carats by 200 to get 366 mg. The width of the diamond grows much more slowly than the carat weight of a diamond.
If you're willing to try a few things to get a bargain, one thing you can try is searching for a diamond which has a strange carat weight, such as 0.96 carats. Often diamonds with these strange carat weights can be picked up for a bargain because they are not as sought-after even though they are practically the same size as the more popular 1.00 carat diamonds.
Although it is not a problem for most people, it is possible for a diamond to be too large. This is much more likely to happen with women who have particularly petite hands. Buying a diamond should really be about what you and your partner want, but if it's really important to you, know that the average diamond size in an engagement ring is about half carat, give or take.
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.
A large diamond which has a huge crack down the middle, or alternatively a big yucky looking inclusion, is not a good look - it looks like someone has gone for size and sacrificed all the other desirable properties of the diamond. Clarity, for example, can be just as important in picking a diamond.
Manners must adorn knowledge and smooth its way in the world, without them it is like a great rough diamond, very well in a closet by way of curiosity, and also for its intrinsic value; but most prized when polished. Lord Chesterfield .