This announcement is sort of intriguing. Arafura Pearls is offering investors the opportunity to become growers. I think I am reading this right but I'm not sure if I have all the information. Investors are invited to invest in the very beginnings of pearl production, to receive payment (in pearls?) when they harvest in 4-7 years.
The investment is $6,950 (probably Australian) for each 100 shells, which can potentially be seeded twice.