Gold was a chemical element much prized by humans. Its chemical symbol on the periodic table was Au. (AUDIO: Escape Room)
Alchemists were rumoured to know the secret of transmutation of metal into gold. In 1866, Theodore Maxtible served the Daleks when they promised to give him the secret. (TV: The Evil of the Daleks)
Gold was a major weakness of Cybermen. (TV: Revenge of the Cybermen et al.)
It was a traditional Christmas gift. (PROSE: All I Want for Christmas)
Gold was used to forge fob watches such as those worn by the Third, (TV: The Green Death) Eighth (TV: Doctor Who) and the Eleventh Doctors. (TV: The Day of the Doctor)
Gold had several isotopes. Gold-197 was very stable. Gold-198 had a half-life of three days, and Gold-194 had a half-life of one and a half days. (PROSE: Midnight in the Café of the Black Madonna)
According to the Tenth Doctor, gold was non-corrosive, malleable and ductile. (TV: Planet of the Dead)
As it was prized by humans; it was an item that could be invested in. During a huge market collapse during Miracle Day, the best advice the people were given was to invest in gold. (TV: End of the Road)
At some point a Cyberman was plated in gold, and being sold on Buy&Sell as a novelty hatstand. (PROSE: Still Need a Title!)
"Worth your weight in gold" was an Earth compliment. (TV: Rendition)
The Animus could control beings that were in contact with gold, which led to it controlling the Zarbi. (TV: The Web Planet)
The Keratin could similarly use gold to conduct and amplify their psychic powers. (AUDIO: The Glittering Storm)
Nero gave Barbara Wright a gold bracelet. (TV: The Romans) The Animus was able to control her through the bracelet. In addition, Ian Chesterton owned a gold pen which disappeared when he went onto the surface of Vortis and took it out. (TV: The Web Planet)
Gold was used to power the teleportation devices of the Linktons, which allowed them to travel vast, inter-galactic distances. (PROSE: The Living Wax)
The Seventh Doctor kept some Warlock in a gold snuff box. (PROSE: Warchild)
Lady Peinforte dipped her gold-headed arrows in poison as her "calling card". (TV: Silver Nemesis)
Flidor was rich in blue-veined gold, which was used to construct the Dalek Emperor's casing. (COMIC: Genesis of Evil)
Prospecters flocked to Mal Oreille, mistakenly believing its yellow-algae infested seas to be rich in gold deposits. (PROSE: Biology Lesson on Mal Oreille)
In the late 1990s, a golden double decker bus was used to convey audience members of Glamorama from Cleopatra's Needle to the studio in an industrial estate in Mile End. (PROSE: Hospitality)
In payment for his service, the Bruce Master offered Chang Lee two bags of gold dust that was kept within the Doctor's TARDIS. The Master claimed the dust, along with the TARDIS, had been once his before the Doctor stole it. After the Eighth Doctor defeated the Master, he let Lee take the gold dust. (TV: Doctor Who)
Using gold as currency fell out of favour in the late 21st century. (AUDIO: The Evil One)
A Delphonian mega-dollar was a large coin made from solid gold. (PROSE: Sarah Jane and the Temple of Eyes)
Owing to its non-corrosive nature, gold essentially choked the Cybermen's respiratory systems. The glittergun, a weapon used during the Cyber-Wars, fired gold dust at its targets to exploit this weakness. Adric's badge was gold-edged, allowing for the Doctor to grind it into the Cyber-Leader's chest and asphyxiate him. (TV: Earthshock)
Gold appeared to affect some varieties of Cybermen in the way that silver affected werewolves, so that gold coins or gold-tipped arrows fired at them had the same effect. (TV: Silver Nemesis)
During a time period in which the Cybermen had been reduced to small remnant groups wandering around the galaxy, one group tried to take revenge by making a desperate attempt to blow up the remnants of the planet Voga, a planetoid of pure gold that had wandered into the solar system and had become a moon of Jupiter. They hoped that this would disrupt their enemy's supply of the element. (TV: Revenge of the Cybermen)
While trapped on San Helios, the Tenth Doctor determined that he needed gold to combine the anti-gravity clamps with the systems of the 200 bus. In order to do so, the Doctor took the golden Cup of Athelstan from Lady Christina de Souza, smashed it to bits with a hammer and successfully used the gold to combine the two systems. As a result, the Doctor was able to fly the bus back through the wormhole to Earth. (TV: Planet of the Dead)
During the Battle of Hedgewick's World of Wonders, the Eleventh Doctor used a golden ticket to temporarily disable the Cyber-Planner known as Mr Clever. (TV: Nightmare in Silver)
After the Sky vessel crashed in Nottingham in the 12th century, the robotic knights manning the ship worked with the Sheriff of Nottingham to use gold to repair the ship's engines. To this end, the Sheriff stole the gold from the local population for their use. While onboard the ship, the Twelfth Doctor didn't believe that the knights had enough gold to repair the ship.
After the Sheriff was killed when Robin Hood knocked him into a vat of molten gold, the two remaining knights launched their ship. The Doctor recognised that the ship lacked enough gold content to make it and if it exploded on Earth, it would take out "half the country." Working together, the Doctor, Robin Hood and Clara Oswald shot a golden arrow into one of the engines, providing enough gold content for the ship to make it into orbit. Once there, the engines went critical and the ship harmlessly exploded. (TV: Robot of Sherwood)
The planet Megerra was rich in valuable minerals such as gold. (PROSE: Shakedown)
Gold was abundant on Sorva. (AUDIO: Aliens & Sex & Chips & Gravy)
In the 23rd century of the Federation universe, the communicators of the United Federation of Planets had covers made of out of gold. When joining forces with James T. Kirk against a group of CyberNomads, the Fourth Doctor used the captain's communicator to disable the Cybermen. (COMIC: Assimilation²)
Jewellery
In September 2006, Cathy Salt wore a gold necklace which was prodded by "Margaret Blaine", actually Blon Fel-Fotch Passameer-Day Slitheen in disguise. (TV: Boom Town)
In 2010, Amy Pond wore a gold necklace in the shape of the letter "A". (TV: The Eleventh Hour et al.)
In 2050, mother and daughter June and Jorjie Turner wore matching gold necklaces in the shape of the letter "J". (TV: Regeneration et al.)
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