If I have instructions and they are designed for lets say quartz RI 1,54. And I have to cut sapphire.
How do I know the angles? i know that you cut quartz 2 degrees deeper, but I have red here that sometimes you can use same degrees for lets say 1,54-2,00 RI with that particular instruction.
If the instructions do not tell that you can use same degrees for 1,54-2,00 what shall I do so I do not cut the gem wrong?