indigo blue vs sapphire?

i've seen both Indigo & Sapphire in person, but did not hold onto them ... I think of BV's colors as being so "layered" (never simple, rarely boring:smile:). So, I'll try to give my take on the "layers" that I saw in the 2 colors ...

Indigo appears maybe a shade and a half darker than sapphire. Indigo is also more muted than Sapphire. Sapphire has a layer of royal blue that I didn't see in Indigo. To this end, Sapphire has a touch of "brightness" that I did not see in Indigo.

I've read that some people see a bit of purple tone in Indigo, but I did not see that. Good luck ~