I'd like to present the court with "Exhibit A":
Essentially, all of the JC gems appear to have been buffed on the PTR; if it was once worth +67 of your favourite statistic, it's now worth +77. This is true across every Chimaera's Eye, even the stamina one (which few warriors are using) has gotten a 10 point buff.
I can't check the other professions at the moment, as your copied characters only get enchanting and jewelcrafting (ring enchants are unchanged) - but I'd imagine this is something of a re-balance to avoid blacksmithing being the profession of choice once epic gems hit servers.
Did I miss an announcement on this?