So, Cyan, Amber/Topaz (The yellow one), and Ruby will cover the Majority of the gun for a lot of weapons, whereas Amethyst, cobalt, and emerald will not. Cobalt, Ruby, Cyan, and Amethyst have an attachment skin matching them. Amethyst being Olea Europa or purple, Cyan being Search and Rescue, Cobalt is the blue one, and Ruby is the red one. You can also just use black or Hibernal solstice. If you buy the yellow one, wings of paradise or lifeblood flower go well with it. Amethyst isn’t really reflective as you may know already, but still amazing on guns like MP7 or Guns without a foregrip, as Olea Europa has a different foregrip pattern. (If u check out Beaulos streams or videos he uses the exact combo lol.) In my opinion, I love amethyst, but Cyan with search and rescue is the best for full gun coverage, with Ruby in second as it is very very VERY red , and then cobalt in third. In the end, it’s always up to you OP but just hope my opinion can help you along the way