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Recently, this blog already featured two articles about unusual triangular gold coins, the Bermuda Shipwreck coins as well as the Royal Australian Mint‘s Australian Shipwreck coins. Both of these rare collectible coins are shaped like a Reuleaux triangle. Another unusual and rare collectible bullion coin that has a triangular shape is the Tutankhamun Sand Triangle ... Continue reading

If you have read our recent article about the Bermuda Shipwreck coin series then you’re already familiar with the concept of triangular coins. However, there is another series of gold and silver bullion coins that have the unusual shape of a Reuleaux triangle. These are the Australian Shipwreck coins of which 4 issues were minted by ... Continue reading

As already discussed in previous articles, one proven way for a mint to increase its sales is to issue special collectible versions of its bullion coins. No matter whether these coins distinguish themselves from the regular bullion coins by a special finish, the addition of a mint/privy mark, the selective application of color to the ... Continue reading

Collecting precious metal coins from exotic countries is one of the joys of many numismatists worldwide. The appeal for collectors of such exotic coins is enhanced by such factors as scarcity, an unusual shape and/or design of the coins, selective coloring of design elements, the use of rare metals such as black rhodium etc. Among ... Continue reading

Apart from the few gold and silver bullion coins that change their reverse design each year like the Australian Gold Kangaroo coins or the Chinese Gold Pandas and Silver Pandas, it is highly unusual for a long-running bullion coin series to make a change to its design. The US Mint however has decided to do ... Continue reading

If you have read our recent blog article about the Japanese Gold Oban, you may be able to guess that the Japanese Gold Koban must be a similar ancient coin from feudal Japan. That is indeed the case and you may consider these two types of ancient Japanese gold coins as sort-of relatives. The essential ... Continue reading

As private and government mints constantly try to find new ways to attract buyers for their numismatic precious metal coins, there are always new trends emerging. One of these is the plating of silver coins with rare and seemingly exotic precious metals such as rhodium. While black rhodium-plating certainly gives numismatic silver coins a more ... Continue reading

Whereas gold, silver and other precious metal bullion coins are traded as commodities worldwide and have a constantly fluctuating spot price, the same is not the case for diamonds. Their value cannot be standardized in the same way, at least not until now, since diamonds don’t only vary in size (carat) but also in color, ... Continue reading

Most coin collectors have probably never heard of the Japanese Gold Oban. That is not really surprising since these oval gold plate coins (the Japanese word ‘Oban’ means ‘big plate’) were minted a really long time ago in Imperial Japan and never in large quantities. Many people may have seen an image of such an ... Continue reading

I’m sure I’m not the only one who thought that the Royal Mint‘s series of Queen’s Beast gold coins and Queen’s Beast silver coins had ended in September 2020 with the White Greyhound of Richmond issue. Even though all ten heraldic beasts had already individually appeared on the reverse of a coin issue by then, ... Continue reading