No one. Alchemy no longer exists. Alchemy was abandoned because it didn't work. Some of the things that did work became chemistry. No one successfully turned lead into gold. Nor did anyone successfully create the philosopher's stone. Alchemy was basically chemistry with a lot of magic thrown into it. The alchemists were sorcerer want to be's. They attempted to conjure spirits, and use spells on chemicals that they believed contained magical properties, all in a vain attempt to convert base metals into something of greater value. Even Isaac newton, probably the greatest scientific mind of the last 500 years, accomplished nothing in alchemy, even though he experimented with it for decades.
Cerium was not known by alchemists.
The alchemists were unaware that atoms even existed.
Most of the strongest Alchemists appear to be men.
Alchemists. Alchemists.
Alchemists believed that mercury could be transformed into other metals,including gold.
Alchemists believed lead to be the oldest metal. It was associated with the planet Saturn. Lead was once refered to as "salt of Saturn" by alchemists and early chemists
Artists and Alchemists - 2011 is rated/received certificates of: USA:TV-G
The Alchemists - 1999 TV is rated/received certificates of: USA:PG-13
The alchemists were trying to make gold out of ordinary things.
Alchemists could not turn metal into gold because gold is an element.
Alchemists tried to make GOLD from base metals. Scientists know that theoretically Gold can only be made by altering the number of protons in an atom. Alchemists did NOT know about protons etc., .
I don't think "alchemists" is the word you meant to use, because your question does not make sense. Alchemists are people who try to magically turn lead into gold, or otherwise magically turn one substance into another.