Just had a read and I think its more advertising than truth. It...

Just had a read and I think its more advertising than truth.
It is the cut not the colour that gives a stone sparkle. Usually a brilliant cut gives better sparkle and a modified cut shows better colour (all to do with the angles).
Argyle do not have better browns than most mines in fact most are generally poorer quality (though you can get some very nice browns with a pink tinge).
Colourless diamonds do not have better quality than brown diamonds it's all down to mother nature as to which stone has an inclusion or crack.
Browns with a secondary colour are usually a higher price than just "beer bottle brown".
Nobody has run with marketing them as beer bottle brown yet!
Hopefully this is more truth than BS.