Natural Citrine is pale and often Smoky, and much more expensive than the heat-treated Amethyst that becomes quite orangey during the process to create processed Citrine. If the colour is strong, it is probably not the natural type of Citrine. Both the natural and the hand-processed have Citrine properties, but these vary and there is often a personal preference. I will make it clear in the individual descriptions of each listing, which 'variety' it is.