I look at these, and I wish they'd make an Amethyst compilation. I loved the maxi series, but I didn't like some of what they did in the subsequent series afterwards (like Mr. Winston having an affair, Mrs. Winston going a bit crazy, the youngest Princess Emerald taking Amy's place).
Looking back at this, I can also similarities between it and several manga, like Sailor Moon and Magic Knights Rayearth, where the girls find out that they have secret powers or go to another world and become superpowered and have to save the world.
I've also looked at Winx Club and thought back to Amethyst. Amethyst would make an awesome animated series.
Amethyst, Princess of the Gemworld was ahead of its time.