Nice coin, released in 2018. Here is the info that was posted when it was released: Baird & Co., Britain's only gold refinery has launched the world's first legal tender coin made of rhodium: the Tuvaluan $100 Coin. First mintage of only 1,000 coins! Rhodium is the one of the world's rarest metals. It is a brittle metal which when refined metamorphoses into a dazzlingly bright, silver metal. A member of the platinum family, rhodium is 100 times rarer than gold. Baird & Co is the first company to develop the technology to manufacture rhodium bars, coins and jewelry that are machinable and not brittle.
The Tuvaluan $100 Coin is similar in size to the UK's £2 coin and also features the Queen's head. That is where the similarity ends: the face value is 100 Tuvaluan dollars (approximately £55). The coin won't scratch or tarnish - rhodium is highly resistant. The coins are legal tender in the South Pacific island of Tuvalu, a member of the Commonwealth which became independent from Britain in 1978.
Other mints have used selective black rhodium plating to enhance coins, even the
Royal Canadian Mint.
https://www.numismaticnews.net/worl...-used-canada and
https://www.mint.ca/en-us/shopping/...-prod-202527It seems many now use Black Ruthenium as its far less expensive and quite nice look to them for collectors looking for something different while having low mintages as another benefit in some cases, Here are some american silver eagle examples and others.
https://firstcoincompany.com/S/usa-...ed-1-oz-2014 and
https://firstcoincompany.com/S/inde...ilter_tmp=no