D is the final supergem with grade +3 and cost x16. You can (even should) repeat this method every time when upgrading gem.
You use method 1 once and then on resulting gem method 2 till your mana ends for mana gem. Just don't forget to add red at some point, best g1 to one of 16 copies of your gem in method 2.
For amplifiers I recommend now pure orange (black isn't amped anymore) so you grab g1 and apply method 2. Amplifiers with this method should be 3 grades lower than mana gem.
After a moment of thinking I realized that this metod works also for killing gems, but you have to farm kills on black/red gem and add it in some moment. Feel free to try.
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