Hey, hope it's okay for me to post here! I was reading your post and saw that you were a little bit unsure about FR pricing/rarities; just wanted to let you know that the FR value of pets is just the C$ value * 6 for gems, so as long as you know the general value of a pet here, you should be okay. :3
The C$ guide for pets is really helpful for that!
Then for treasure it's just the number you got from C$*6, multiplied again by whatever :treasure side of the gem:treasure conversion rate you're using.
I have a couple of list pets if you wanted to look but mostly wanted to give adviceeeee