i have a parcel of Tourmaline from the pederneira mine, minas geiras, brazil, blue-green pocket 2005. i am currently at the gem show in Tucson. what is the value of this particular type of facet-quality tourmaline? there r some inclusions. color ranges from pale blue to deep blue-green. any other info is greatly appreciated. 1st time buyer/seller of tourmaline. this parcel is a 1-time find i understand.