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).
2.09 Carat Diamonds
The width of a diamond with a weight of 2.09 carats is about 8.37 mm. The girdle thickness of the diamond plays an important role in determining the apparent size of the diamond - a diamond with an unnecessarily thick girdle will appear smaller than a diamond with a thinner girdle.
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Profits on the exchange are the treasures of goblins. At one time they may be carbuncle stones, then coals, then diamonds, then flint stones, then morning dew, then tears. Lope de Vega .
Savvy diamond buyers have learnt to search for diamonds that do not have round numbers in their carat weight - for example, these buyers will search for a diamond with the carat weight just below one or two carats. Diamond carat size doesn't narrow down your list of diamonds very much, what you really need to do is consider what the other desirable properties of the diamond, decide how good these properties have to be for your situation, and then search for diamonds which meet all of these property requirements at the same time.
Not all gemstones have the same density, leading to an often confusing fact that when you look at a one carat diamond and a one carat ruby, apart from differences in cut they will probably appear different in size due to the difference in their density. 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.
In the quest for finding the largest diamond possible within a budget, it can be fun to consider famous large diamonds like ashberg diamond, which had a huge weight of 102 carats - about 200 times the mass of a diamond used in a typical engagement ring. So how good do you think a 10 carat diamond which looks a horrible uneven black colour would appear on an engagement ring? Exactly - diamond buyers need to also consider other properties such as the colour of the stone, which is not picked correctly can negate any attractiveness of having a very large diamond.