Welcome!
About mahou shoujo VNs, sadly, the most recent non-smut mahou shoujo game overall (not just VNs) that I remember having checked is some Sailor Moon RPG for the SNES (and tbh, I can't remember many smut ones either), so sadly, I can't help on that front.
About the parakeets' names, they're not as usual. I liked the creativity!
And on the topic about stones, a little trivia: amethysts are a type of quartz. Certainly don't look like so to me, with how fragile amethysts tend to be.