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).
0.19 Carat Diamonds
The diameter of a 0.19 carat diamond is approximately 3.73 mm. Although there is a strong correlation between the carat weight of a diamond and its width, this does not guarantee that every 0.19 carat diamond is 3.73 mm wide.
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Searching for diamonds will often reveal many possible candidates and one way to help differentiate among them is to work out the costs per carat value for each diamond.
You shouldn't really worry about this, but the average size of a diamond in a diamond engagement ring, at least within the united states, is about half a carat. Five small diamonds that add up to one carat are generally not as valuable as a single diamond that weighs one carat, so be short not to compare a single diamond of carat weight 0.19 with a ring which has a total diamond weight of 0.19.
I never hated a man enough to give him his diamonds back. Zsa Zsa Gabor .
Don't forget to think about other diamond characteristics such as diamond cut, which plays a critical role in determining the amount of light that gets into the diamond and the degree to which the diamond sparkles in light.