Here are pics of my Tiffany semi-eternity 2mm and 3mm channel bands. Sorry these pics are not the greatest and the bands are too big as I wear them as RHRs.
First pic - e-ring with 2mm
Second pic - e-ring with 3mm
Third pic - both bands together
Fourth pic - both bands with the e-ring
I hope this helps.
Definitely can tell the difference.
Btw how big is your solitaire mattallston? Cuz it looks pretty big!