[BUG] Enigmatic skyfire diamond

I put this on my arena helm, but it doesnt give the 12 critical strike rating atleast according to crit chance panel on character tab.

The requirements on it is more red than yellow gems.

I have:
head: meta, 4str/4crit (red/yellow)
shoulders: 8str, 4crit/6sta (red, yellow/blue)
chest: 8str, 8str, 4crit/6sta (red, red, yellow/blue)
bracer: 4str/4crit (red/yellow)

that counts as 5 red / 4 yellow

The gem shows as white on the helm, if i take the chest off that has 2 red 1 yellow, the gem on the helm turns grey. So in any way i do meet the requirements but do not get the bonus.

You can see my gear here except the helm which is gladiator helm with enigmatic skyfire diamond and potent noble topaz (4str/4crit)
http://armory.wow-europe.com/#character-sheet.xml?r=Magtheridon&n=Nakki