Mine rough ametrine all natural untreated crystal mixed grade facet/cab/tumble/carve from Bolivia in 1/2 pound lots scooped  from material as pictured,,picture taken dry without flash,,with piece size running approximately 1/2 to 1 1/2 inch with the colors running from lite to medium mostly lite amethyst and lite yellow citrine but definitely visible as ametrine.This ametrine crystal is mine rough and all natural just as it comes from the earth in Bolivia.