maybe?? i feel like the Sunlight would pass through the gemstone (or reflect off it, whatever) but the Investiture, the Sunlight itself is stored in microflora, not the gemstone, so you could illuminate the gemstone, but not store Taldain investiture. does that make sense?
also how do we know microflora responds to other kinds of investiture? not that i doubt you, i just want an example.