Hopefully this time I will be VMing the _right_ person!
Your Sapphire is certainly fake. Your Emerald probably is also.
A genuine Emerald cartridge:
Is translucent green.
Has an internal battery in the top right corner as seen from the label side. (The label blocks easy view, but you can just about see it)
Has
MODEL NO AGB-002
PAT. PEND. MADE IN JAPAN
embossed on the back
Is held together with a tri-wing screw
Has
(C) 2002 Nintendo AGB-E05-01
printed on the PCB just above the contacts, you can see it by looking into the contacts. (The exact numbers may be different, that's what's on my UK cart, but nothing there indicates definite fake).
Should have some letters and numbers indented into the label.
May complain that the internal battery has run dry upon startup, but should not give messages like "the saved data has been loaded".
Was not bought off eBay from a seller with dozens of 'new' Pokemon games listed and shipped with the box folded up and a very small manual ;-)