Yup, Orly is right - the dot on the item means that the item is dyed. The colour of the dot reflects the base colour - so a pink dot means that it'll be pink. You can dye equipment yourself (by doing the quest chain from Richard that unlocks dyeing, and then using dyestuff), though some equipment is already dyed when it drops (which is what happened for your egg shell - when it dropped from the ruby guardian, it was already dyed pink).
Now someone should put that on the Wiki. XD