Seems like their marketing scheme is working then if you're spending so much time looking at their account.

If someone asks for a link to buy them, then that isn't an ad. That's someone asking where they can buy them. If OP were putting a call to action straight away in the post, with a call to action directly in one of the photos, then yeah, that's an ad. As an artist and jewelrysmith myself, I see nothing wrong with this post.

Wow, you saved the day. Here, have a medal. I typically sell these medals on Etsy at www.etsy.com/r/gifs but this one for you will be a gift. Enjoy my handmade state-of-the-art medal, made entirely by hand out of med and al.

Joking aside, there's no call to action. This isn't a straight up ad. It's just someone sharing their work. Just enjoy looking at it. They're not telling you to buy it.