Titanium Nitride has the colors. Those gold colored drill bits at the store are TiN plated. And since titanium changes color depending on the voltage of the plating. There's gold to purple. Straw, blue. I don't think there's a red. I haven't seen it.
Somewhat related question. Can DLC be reapplied? I got a Heretic Medusa for a significant discount because the DLC is a little thin near the tip on one side; It doesn't really bother me, but I just thought I might as well ask.
I’ve only seen true DLC (a specific type of PVD, the hardest of them) in black. PVD can come in black, dark grey, gold, rose gold, copper-ish, blue, and a somewhat coffee color. Can’t help you with good outsourcing companies.
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