My BF picked up some ramekin/soup thingies at Goodwill. Both kinds say they are both dishwasher and microwave safe, but don't mention being oven safe. They are both glazed stoneware.
I was under the impression that all stoneware is fairly oven safe. I've used on set of these in the oven so far, but it was a short period of time (10 minutes or less; just broiling some cheese on soup). Would I be seriously unwise to try to use these for pot pies or something that needs to be in the oven for a while?
<Both kinds say they are both dishwasher and microwave safe, but don't mention being oven safe.>
dishwasher and microwave safe are not necessary the same as oven safe, and vice versa. Case in point, many tupperware are microwave safe, but they cannot be put in an oven as baking or roasting vessels.
<all stoneware is fairly oven safe>
Fairly is the key word here. Most stoneware went through high temperature for their creation. However, some of them may have trouble to go through hot-cool cycle repeatedly -- over and over. Just because you can do it once or twice, it does not mean it won't crack in the 10th or 20th time.
Since they came from the Goodwill I assume they were pretty cheap. Although if they were ovensafe they should say it on the bottom and I would assume they are not since it does say they are microwave and dishwasher safe. That said, you could always try out your recipe with just one of them placed on a cookie sheet in case it breaks. I have a piece that I can put in the oven as long as it is 350 or less and doesn't go from frig to oven.