|Game(s)||Tomb Raider Chronicles|
|Level Found||The Colosseum|
It was one of the first artefacts Lara was after in her adventures.
Not much is revealed of the artefact's history during the game, but it's most likely sought for because of its said powers.
In Tomb Raider Chronicles Lara travels to Rome to search for it. The stone lay within the Philosopher's Gate that could only be unlocked by retrieving the God Stones, and defeating the Stone Serpents that guarded it.
After defeating the Serpent Gargoyles and opening the Philosopher's Gate, Lara made it to the artefact. However, when she tried to remove the stone from its resting place in a wall of gold, the platform she was standing on gave way. Lara was casted into a long tunnel that led to the catacombs of The Colosseum. Lara then found another way back into the temple through the Colosseum. She made another more successful attempt to remove the stone using a crowbar.
Red, delicate gemstone with a rough stone bottom.
The stone upon contact would turn other metals into pure gold. The wall it was embedded in, was already made of gold when Lara removed the stone.
The Philosopher's Stone is more a legendary alchemical substance than an actual stone. In addition to turn metals into gold or silver, it was believed to be an elixir of life - useful for rejuvenation or even achieving immortality. Mentions of the artefact can be found as far back as cirka 300 A.D. 
- The four artefacts that are needed to open the Philosopher's Gate
- The mysterious gate that guards the Philosopher's Stone
- Dialogue between Winston Smith, Charles Kane and Father Patrick during an in-game FMV
- http://en.wikipedia.org/wiki/Philosopher%27s_stone Retrieved on 12th Dec 2012