The famous 4C that is the of Diamond pricing Bible doesn’t work for Sapphire. When I started my first steps in the trading, a trader told me ” Sure we have the 4C when we price the sapphire C1 – color, C2 – color, C3 – color C4 – color” 🙂 for a Sapphire color is the King and will have very big influence on the value of the stone.
Today some cutter use the excellent grade “precise cut” as a promotion to get a better price for stones with lower color grade I made three charts using GemePrice calculator for a 1.5 carat blue sapphire. As you can see the difference in the value between the cut grades “excellent,” very good” and “good” are small
All our sapphires are above “good” cutting grade