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).
0.70 Carat Diamonds
0.70 carats in a diamond gets you around 5.79 mm of diamond, give or take.
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The shallowness of a diamond, which depends on how the diamond has been cut, will affect the relationship between carat weight and diameter of the diamond - because of this reason, 0.70 carat diamonds will only average a width of 5.79 mm, but will not always be precisely this 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.
There are many sham diamonds in this life which pass for real, and vice versa. William Makepeace Thackeray .
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.