Ceramic Baking Stone
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Question
I bought a ceramic baking stone, does it require immersion in a mikvah?
Answer
Shalom and blessings
For the benefit of the readers of this answer, I will explain the essence of your question:
A 'baking stone' is a surface made from a composition of ceramic materials, capable of reaching very high temperatures - over 1500 degrees Celsius, without damage. It is used for making ceramic tools and is suitable for baking certain pastries, such as pizza.
According to Halacha, metal and glass utensils require immersion, while ceramic utensils do not require immersion.
Utensils made from various materials, especially new composites for which we do not have a clear definition in the words of the poskim, should be immersed out of doubt, lest they be considered as glass or metal.
Since the immersion is out of doubt, no blessing is recited on the immersion.
Source
Shulchan Aruch, Yoreh De'ah, Siman 120