The L'Oreal Infallible eyeshadow in 755 Gilded Envy is a new shade that launched with the L'Oreal Butterfly collection. I believe it's permanent. I've seen it pretty much everywhere that L'Oreal Infallible shadows are carried.
L'Oreal doesn't offer a specific description as far as I can tell. It's a very golden green. In the pan, it looks much more green than it shows up on the skin. On the skin, it's definitely a tarnished gold color.
Personally, I find the Infallible shadows to vary a lot in texture from silky smooth to a chunky nightmare to apply. Gilded envy is on the chunkier side to me, but it does apply well (unlike my much loved Amber Rush - beautiful color, total pain to apply). It has good pigmentation, but sometimes it takes a bit of work to make sure you have uniform color coverage.
As with all of the L'Oreal Infallible shadows I've tried, it wore really well. I don't know that I buy the 24 hour claim, but it definitely holds up for the work day.