What is Diamond White Brute

I have a mandate who's buyer is looking for diamond white brut. (I deal with gold and others but not diamond) I've not heard about it. But since someone is asking there must be something out there.
From any of your expertise please assist me on this so that i will get an informed situation. BTW if i have a seller who is willing to buy diamonds what are the process to this. I've some articles in here saying to meet person to person and do the deal on the spot. How can I do it alternatively.