@Soy_Magnus I don’t buy them unless they are very green.
Emerald is one I rarely get to cut because I can’t afford good rough, and most of the ones needing repair also need oil treatment, which I don’t do.
Traditional oil treatment of emerald involves submerging them in cedar oil in a dish and putting g them under vacuum pressure to force the oil into the stone to fill voids。
Looks very pretty but breaks down over the years when exposed to detergents.