I'm with Myrrha. I don't like too many different energies. So I stick to either mostly protective jewelry or mostly recpetive jewelry, depending on the situation.
However, I do think marcasite works very well with almost any stone be it receptive such as amethys or blue topaz or protective like garnet. Diamonds, which are protective, are the same, but, need I say, pricey.
Oddly, I get good protective/projective results with clear CZ's. They are nearly as good as diamonds, imo. The colored CZ's are worthless.
I have yet to purchase any of the new treated stones like pink topaz or green amethyst. I do have my eye on some green amethyst. Has anyone else purchased...
green amethyst
pink topaz
celestial topaz
twilight topaz
lemon quartz
??????????