I can shed some light on this. I just ordered a G11 7 Series in Dravit Grey last week which should be with me next week
. At first, I wasn't sure about the colour and assumed it would be essentially just a grey.
However, in real life it's a fantastic colour. In overcast light it almost looks like Audi's solid Nardo Grey, but in direct light there is a beautiful amber effect. I was comparing this colour to Tanzanite Blue and I would say that this is a much nicer and more unique colour. I've added an Imgur album below:
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