I create all of my jewelry with AAA-graded gemstones. In Gemella Jewelry you often find:

Aquamarine (the pale blue variety of beryl)
Heliodor, which is yellow aquamarine

Chrysoberyl, a lustrous yellow-green gem

Citrine, often pale lemon or deep yellow
Ametrine, a mix (in the same stone) of citrine and amethyst
Amethyst, often deep violet, but occasionally lavender
Prasiolite, often called "green amethyst."

Kyanite, a deep sapphire blue (from the Greek "cyan")

Tunduru, Songea, or UMBA Sapphires (each so-called for the region in Tanzania from which they originate)

Topaz, either London or Swiss Blue
Tourmaline, often in chrome green, rose,
    or the rare and stunning indicolite - my favorite!
Zircon