Star Ruby Encrusted Steins are some of the best things to make in Classic EQ for raising your Pottery. This item has a trivial of 335 which means you can easily max out your Pottery by making it. In addition to these items being good for you to use to boost your resistances they're also part of the Luclin Earring of the Solstice Quest.
(Direct Route) Unfired Star Ruby Encrusted Stein 200 - 335
Once you have all of the required ingredients, combine them together in a Kiln.