The alloy we see most frequently used for tungsten alloy fake gold brick is substandard gold, for example it sovereigns are made in the middle east and marked 21ct (but in Arabic), and we believe these are usually approximately 21ct, as opposed to 22ct gold. We also see tungsten fake gold brick sovereigns which appear to be around 18 to 20 ct gold, as well as some made of copper or bronze.
Just before we added this paragraph, we noticed a Wikipedia page about investment gold stating that lead is commonly used to make tungsten alloy fake gold brick. We cannot remember when we last saw a lead counterfeit of a gold brick, it is quite an infrequent occurrence. Lead would be too soft, feel wrong, and sound wrong. It would therefore be a very easily detectable fake, and probably not worth the effort of forger setting up any serious volume production.
Platinum has been used in the past!
We also see reports that tungsten can or are used to imitate gold brick, which is tungsten alloy fake gold brick. We have never yet seen tungsten fake, and consider it unlikely as tungsten must be quite difficult to work.
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