Gem Cutting

Rough gem cost against selling the cut gem on the Grand Exchange, with the 2% tax already applied. The 6 standard gems have no chance to break — yield is a real 100%, confirmed on the Wiki.

Item	Confidence	Level	Ingredients cost	Revenue	Profit
Sapphire	100	Crafting 20	233	249	16
Emerald	100	Crafting 27	502	421	-81
Ruby	100	Crafting 34	1,105	840	-265
Diamond	100	Crafting 43	2,406	1,698	-708
Dragonstone	100	Crafting 55	15,030	10,861	-4,169
Onyx	20	Crafting 67	2,672,000	2,009,000	-663,000