won't buy one that even pretends to be old. ..I agree with this one.
I would just like teaware that I can start using. ...simple porcelain gaiwan
A nice pot and gaiwan made of clay that aren't going to leach added chemicals ... you are not going to see it from the picture .
You would have to learn bit about the chemistry :
1) find out what chemicals they use in order to keep the clay "stable" in kiln when fired. (means the chem. which reduces the contraction of the clay to minimize cracking or defects like the lid is not sitting right, nozzle or handle are not straight etc.
2) Which chem. is used for making the clay more "stretchy" , which is useful for machine made molding ( clay is not ripping apart when goes trough the rolling drums ) .
3) which chems. they use for coloring. A document made in China ( I think somebody reposed on YT as well ) where was some Yixing factory offering like a
Menu of Desired Colors and instead of the prices on the side as on restaurant menu is, there were the chemicals. So was like : Dark green .....FeNh2 ...something something... (just making it up, Im not chemist ) ..but something like that. Funny that they aren't even hiding it, sad that they are doing it.
4) find out which one of those chemicals actually can leak ( dissolve ) in to your tea ( water 100C ) from the clay after being fired in the kiln.
I read a lot of articles that say experience buyers are getting scammed, even sources are getting scammed. So how is a newbie supposed to be able to decide what they want, find a reputable source who themselves won't get scammed, and get a nice bit of teaware?...yep, agree also with that one.
Some even very famous vendors have that problem and I'd would suspect that they don't even bother with authenticity anymore. Not talking about the tea-ware only. The tea biz is so full of fakes that honest vendor spends so much time to source the real stuff and on other side the customer wouldn't appreciate the price ( coz going for very old gu shu is time consuming for example , and time = is also money ) . Similar for the teapots.
People in general want to hear that product is authentic , organic , handmade and cheap ( or at least affordable for them, which is also individual ) ...so some vendors follow that demand despite possible failure ( means some customers might eventually find out that's not true ) . As long as the number of believers / buyers is higher than complaining customers. I can see that concept working on couple of very known vendors whom reputation is solid already so can go much further ( dare ) with some claims.
Same as with an organic tea ( topic also her in forum ) , I've never heard of any customer buying some teapot from vendor and posting review such : "
I've paid lab for running the tests to find out if any chems. in that clay , and this clay is clean..good vendor! " Which in this case should rather mean : "This tea pot is good!" , coz it doesn't guarantee the others are clean as well. There are some portable tests for heavy metals , but not sure how reliable / sensitive it is.
We generally do Jianshui pottery ,since we live near and just go to studio and order the batch ( hand made ) . I've spent there few weeks observing what , where , how , who ...so I know some stuff alright. We also have relatives there making a pottery ( but expensive one only for CN customers ) , so knowing some background stuff is also helpful.
But can not say anything about Yixing though (although it's on my list).
I wouldn't dare to recommend any vendor but in general I'd start looking for somebody who lives there or at least near to there. If there is any foreigner ( I'd be skeptical ordering from CN vendor , coz I do biz with many of them ) who knows the stuff and doing it for a while, there is a chance you get good teapot for fair price.
In such a time of powerful internet is possible to pretend to be anything doing whatever thing , so it's useful also read the vendors blogs . you will find out the timing ( if written all in "1day" or in span of some time ) and most importantly "how it's written" .
Is it a beautiful nice and to read tea story with all wonders of Gong Fu ceremony world or are they writing some real stuff ? ..u know what I mean.
I see many new vendors popping out of nowhere , doing videos, blogs, instagrams ..and it's all bout the
bright side of the tea culture. I call it The Tea Romance.
Not many vendors write the real stuff coz either don't know or not suitable for the business ( means customer to know ) .
You can also email the vendor with the questions and see the respond. The experienced
salesman will answer something like: our pottery is certified , clean, we test it , we source from trusted source and blablabla.
The honest vendor who lives in China and doing biz here, would write you a completely different answer.
Even private teapot maker doesn't know what is in the clay because buying it from the separate manufacturing company in some bulk shape already prepared for molding. The master doesn't go out to the mining place with shovel to get it all done from the very beginning

Different case can be a manufacture / factory, but those would have to keep their numbers in green ( less defects , more orders, more variability in colors ..etc. ) , so chem. are more than likely applied.
The demand for bigger quantity and low price for something calls for adjustments , same with food , clothes etc.
There is a pottery which is not that popular and still hand made ( or wheel made ) with clean clay coz locals don't know how to apply it and no need because making in small scale. Usually made by some Yunnan ethic minority , so more complex stuff like teapot is bit difficult to them to make. We found some last year but didn't buy coz the precision of work still wasn't there and price was too high for what it was.
Anyway, good luck with search!