the CEMA BB has directional marks on all parts. hard to get it wrong unless you accidentally interchanged L and R. always gently screw it in by hand first.
I ordered the ceramic CEMA (thought i try ceramic once again). took me 2 aproached with this thing to get dub wide chain line spacing sort of right.
after a few km i wanted to try different crankset. but ceramics bearings didn't survive a really really mild hit with my rubber hammer onto the spindle 
anyone got long term experience with the CEMA ceramic bearing? can't believe it is that fragile
CEMA is a high end Berring manufacturer and the quoted price from Light Carbon was well below retail. Pro teams use this brand due to the ABCE5 precision. I have seen standard BB selling in the UK for 150 pounds. So my price was under $80 dollars.