As far as I know and from most of what has been posted previously, it is made in China. Also, according to the Temptations website, crazing, which may be what you're referring to, is a natural thing that can happen with stoneware. But not all stoneware is the same, and the better quality does not have this happen. Crazing tends to happen mostly when stoneware pieces have not been fired properly in the manufacturing process. There is a lot of information about it if you google it.
I have had issues with this in my own pieces, and I will NOT put them in the oven with these tiny hairline cracks. Therefore, I no longer buy it.
This is what is on the website. You will notice that this is never mentioned in any presentations about the product on QVC:
What is crazing? Is it covered under the warranty?
For those who aren’t familiar with the term, crazing is what happens to stoneware when the ceramic material and glaze expand and contract at different rates. When this happens, hair-line cracks can develop, commonly known as crazing.
Many things can affect crazing: the age of the product, the number of times it’s been exposed to heating and cooling cycles, water being absorbed in places where there’s no glaze (for example, on the bottom, where it sits in the kiln), and others.
Crazing should not affect the performance of your temp-tations® product. However, if it happens after your 30-day return period has ended, we will send you a new piece for free under the terms of the warranty, and you pay only the S&H fee.