(Largely repeated from PvP chat.)
Evidence of egg-shaped pumice being in early EQ:
http://everquest.allakhazam.com/db/item.html?item=3641
Note one post dated December, 2000 stating that appeared to have been removed from merchants. I recall a nerf on the pumice to add a casting time as well -- it used to be instant-click. This would appear on the classic EQ updates log somewhere around this time.
Egg-shaped pumice was part of classic monk PvP survivability gear. Pre-Kunark, monks were decent DPS and AC, but lousy resists.