Can not create aclehmist gems from unique/special gems

git-svn-id: http://svn.net-core.org/repos/t-engine4@1621 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/talents/spells/stone-alchemy.lua

@@ -40,7 +40,7 @@ newTalent{
 		return gem
 	end,
 	action = function(self, t)
-		self:showEquipInven("Use which gem?", function(o) return o.type == "gem" end, function(o, inven, item)
+		self:showEquipInven("Use which gem?", function(o) return not o.unique and o.type == "gem" end, function(o, inven, item)
 			local gem = t.make_gem(self, t, o.define_as)
 			self:addObject(self.INVEN_INVEN, gem)
 			self:removeObject(inven, item)