Normal Piece of Marble Rock
Only add statistics here if the rates are not affected by a victory of the Furb of Fun in The Colours of Magic world quest.
Sculpting Piece of Marble Rock Pieces of Marble Rock, 375 trials.
After Furb of Fun's Success in The Colours of Magic
Sculpting Piece of Marble Rock Pieces of Marble Rock, 81 trials.
It's better to do it after event The Colours of Magic is done, because if orange wizard wins ,the chance to successfully sculpt Ice Mammoths and Beautiful Marble Statues increased by 900% (multiplied by 10). So you have bigger chance to make achievement after event. (Only if Friedolin win)
Source TibiaWikia