Since aquamarines are available in large sizes, there is no incremental increase in value per carat for large gems. A 50-carat aquamarine will be worth the same price per carat as a single carat gem of equal quality. The gem price is dependent on clarity, depth of color, and to a lesser extent the purity of color.
The IF function is one of the most popular functions in Excel, and it allows you to make logical comparisons between a value and what you expect. So an IF statement can have two results. The first result is if your comparison is True, the second if your comparison is False.
If cell equals. If this AND that. If NOT this or that. If you want to do something specific when a cell equals this or that (i.e. is equal to X or Y, etc.) you can use the IF function in combination with the OR function to run a test, then take one action if the result is TRUE, and (optionally) do something else if the result of the test is FALSE.