You should first watch, if the hardware has the right color, cause many fake Jems (only 7vwh meant here) have chrome or black hardware.
Then have a look at the input jack, if it is like a RG one, it's fake jem. It should be lifted upwards.
Next thing is the Pickguard, many fake jems have just 4 screws at the bottom, the real ones have 5.
Next, in the shop you mentioned, the Fake Jem has not the Edge Trem by Ibanez, but something else, that doesn't fit exactly to the routed body.
And you should keep in mind, that the Ibanez Jem 7VWH with gold hardware has a black tremolo bar, not a gold one as in the fake shop
EDIT* As i saw in the fakeshop, some of the Jems have "Jem JR" printed on the headstock, though they are sold as jem 7v's.
And some have the wrong knobs, not that fender style, but Ibanez rg ones (keep in mind, that not all jems have that fender style knobs, for example the 7VSBL, but 7VWH always have fender style knobs)