I don't pay that close attention and maybe i'm wrong, but didn't it used to be that using a gold glyph on an item gave you the gold value (even if it was a purple item)? It's probably been this way for awhile, but I just noticed that I had to upgrade my jewelry to gold in order to get the higher glyph value. It did used to be that the glyph value was seperate from the item quality, right?