This week analysts forecast a potential setback for Apple as manufacturing issues might delay the launch of the 5.5-inch iPhone 6 to 2015.  GTAT’s stocks have also been hurt by low sapphire yield rates at its Arizona plant over the last two weeks, as analysts from large financial institutes including UBS, CLSA and Canaccord Genuity mark down the company's investment ratings. Analysts from CLSA and Conaccord Genuity have suggested the limited sapphire yield will signal limited usage in the new iPhone models