This was sold to me as natural smokey citrine and looks to be but natural citrine is very rare. I believe this crystal has been heated slightly to give the yellow tint.
I rarely stock anything that has been treated but I don't mind if it has been heated as this is simply simulating and fast tracking what naturally happens to crystals deep in the earth. Also its divinely beautiful
Photos taken in natural sunlight and in the shade
Measurements seen in last photo
Note it does not come in a stand the first photo is of it sitting on a log.