[@Kronshi]

Bloodstone + Carnelian = Cinnabar
Carnelian + Topaz = Jacinth
Aquamarine + Carnelian = Iolite
Marra Mamba + Aquamarine = Cat's Eye Aquamarine
Marra Mamba + Emerald = Cat's Eye Emerald
Spinel + Sphene = Yellow Kunzite

I'll post more ideas soon. ^^"