New Zealand uses the New Zealand Dollar as its circulation currency for daily transactions. The country also issues a number of commemorative and collector coins, including in the internationally popular one ounce of silver format (abbreviated as 1 oz Ag, where "Ag" comes from the Latin word for silver, Argentum). Authorised by the Reserve Bank of New Zealand, the official issuer of these coins is NZ Post - which also issues the country's postal stamps. Manufacturing of the coins is commissioned to various foreign mints.
The coins are "Non-Circulating Legal Tender" (NCLT) and not bullion because they are issued at prices much higher than their intrinsic value and are targeted at collectors who appreciate them for their artistic or sentimental value, and not at bullion investors.
This coin commemorates the Platinum Wedding Anniversary (70 years of marriage) of Queen Elizabeth II and Prince Philip.
NZ Post says about it:
The couple are shown in a photo from their wedding day encapsulated in an illustration replicating the Queen’s platinum engagement ring. The central 3ct diamond is represented by a sparkling Swarovski crystal. While the Queen and Prince Philip were engaged in 1946, it was not formally announced to the world until the following year - 10 July 1947 - when Elizabeth turned 21.
Prince Philip first gave Princess Elizabeth her engagement ring on 8 July 1947. The platinum band was set with diamonds from a tiara given to his mother, Princess Alice of Greece, by the last Tsar of Russia. Unfortunately, despite Philip’s painstaking attention to detail, the ring was too large for Elizabeth’s finger. It was quickly resized so that she could wear it comfortably when the announcement was made public two days later.
This symbol of their affection is a touching reminder of their personal lives together, beyond the very public roles they have played around the world. | 
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