Gosh holographic was a very popular colour that for some reason got discontinued. I was able to grab this shade for £2.50 in Superdrug last year,but I saw it selling on Ebay for £20.00 plus (incredible).
The reason I think this shade was so popular is because of the beautiful rainbow effect it gives on the light.
Colour description: Silver holo that gives a rainbow effect
Drying time: Fast.
Durability: On my nails 2 days without chipping.
Price: Varies depending on seller but normally is £20.00 + for 8ml
Update: Gosh Launched a new Color name Hero that is supposed to be the same has Gosh Holographic