We recently bought a Paraiba Tourmaline from Thailand (picture below) We washed the gemstone in plain simple alcohol and found some color coming from the gemstone. I would advice everyone to check this when buying gems. especially green gems that have inclusions where I think they are using green oil that are used in emerald to do the same on these Paraiba Tourmaline as well.
Pictured above are paraiba tourmaline from our stock. We have sent the gemstone to GIA certification and will update the result.