If an item has 22k white or yellow gold luster, or mother of pearl luster, NO. If it does not have these elements, yes, WITH CAUTION. How to use your pottery in the oven:
Put your room temperature pottery and food in the oven BEFORE the preheat cycle
Putting a room temperature piece of pottery in a hot oven may cause thermal shock, resulting in cracked or broken pottery.
When removing pottery you have baked in, remove with safety gloves and allow the pottery to reach room temperature naturally.
Do NOT place hot pottery in temperatures below 32ºF, as this too may cause thermal shock