Just recently been to a friends house, he recently got himself an highly priced large LCD screen for his PC and it happens to be an extended gamut range type and it reproduced the emerald greens on this 12p stamp very nicely
http://paulreed.me.uk/Images/stamps/12p%20-1.jpg . He also had a standard LCD screen to one side and his PC is set up so the Windows Vista area is extended to two screens which you can click n drag windows/icons etc across from the left monitor to the right and I did a comparison check of that 12p stamp by dragging the Firefox window displaying the pic across between the two monitors and it was real interesting seeing how it looks mint/grass green on the standard monitor and original emerald on the extended gamut monitor.