Bulk gold has a very characteristic warm yellow shine to it, whereas almost all other metals have a grey or silvery color. Where does this come from?

I have heard that this property arises from relativistic effects, and I assume that it has to do with some distinct electronic transition energies in the gold atoms. But what changes with the "introduction" of relativistic effects, that then changes the energy of the frontier orbitals in such a drastic manner?

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    $\begingroup$ see this question chemistry.stackexchange.com/q/16633/95526 $\endgroup$ – Jayadithya Aug 18 '20 at 8:48
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    $\begingroup$ Wow, somebody copied my question. $\endgroup$ – RisingDragon43 Aug 18 '20 at 8:59
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    $\begingroup$ @RisingDragon43 It may even have been future you time travelling to copy your own question. :) $\endgroup$ – orthocresol Aug 18 '20 at 9:16
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    $\begingroup$ @RisingDragon43 FYI, That question was posted 6 years ago and it is quite a "famous question" here. $\endgroup$ – Nilay Ghosh Aug 18 '20 at 9:17
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    $\begingroup$ Poutnik, this relativisitic story should apply to all metals close to Au. What is magical about gold? $\endgroup$ – M. Farooq Aug 21 '20 at 23:35

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