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).
0.31 Carat Diamonds
A diamond which has a size of 0.31 carats is the same as a 31 point diamond.
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A diamond that is sized at 0.31 carats is usually roughly 4.40 mm in the width dimension. 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, 0.31 carat diamonds will only average a width of 4.40 mm, but will not always be precisely this width.
Some online retailers provide, amongst other diamond properties, a property called the cost per carat, which gives consumers another way of thinking about the value of a diamond.
Carat weight is not the be all and end all of picking a diamond which looks as big as possible. The diamond's girdle thickness will also play a role in affecting what the diamond looks like. Ever looked at a similar carat size of diamond and another gemstone and wondered why the stones appeared so different in size? This is undoubtedly because different types of stones have different specific gravity densities, leading to this discrepancy in size.
There are three things extremely hard: steel, a diamond, and to know one's self. Benjamin Franklin .
There are no firm statistics that are universally applicable, but it is generally agreed that the average size of a diamond is around a third of the carat, perhaps a little more.
In terms of diamond properties, the carat weight of the diamond should be considered alongside the many other characteristics of the diamond, in order to find a diamond which is balanced and hence not let down by being of poor quality in one of these departments.
