Chrysoprase rosecuts and sweet tanzanite moons. I am very drawn to the combo of green and purple, and these do the trick. Chrysoprase is a green chalcedony, (which is a quartz), where the green color comes from nickel.
(I also do geology and mineral factoids. Quartz is a silicate = SiO2 = a molecule with one silicon atom and 2 oxygens... Chalcedony is a "microcrystalline silicate" which means the crystals grew everywhere all at once and because of that are more translucent than transparent like a single crystal. Agates are silicates that form with banding, and Jaspers are the same mineral, but even muddier crystal growth, so not even translucent.)
sterling silver, chrysoprase, tanzanite