^ Midnight Blue is closer to Carbon Black than Jerez because Jerez has a purple undertone, whereas Carbon has a blue undertone and an overall blue/black tinge -- but obviously Midnight Blue is bluer than Carbon Black.
But if you're ponying up for Individual, I'd take Tanzanite over Midnight every day and twice on Sunday. Similar tones, but Tanzanite looks far more exotic, which is probably why it's a semi-Individual option (called Individual, but a factory order option) on the 6 Series, at least in the US.
'16 Cayman GT4 (delivery pics
Gone but not forgotten:
'11.75 M3 E92 Le Mans | Black Nov w/ Alum | 6MT (owned 5/2011 - 11/2015)