Like many other mints, the Royal Mint issues bullion coins in precious metals, having much higher intrinsic value than their face value. The quarter ounce (1/4 oz) platinum coins are denominated as Twenty-five Pounds (£25).
The coins are legal tender, but are not intended for circulation. They are targeted at bullion investors or collectors who appreciate the special editions as pieces of art. The coins are typically "one-year" types usually issued in parallel with other denominations with the same reverse designs.
This commemorative coin with face value of £25 celebrates the Platinum Wedding (or 70th anniversary of the marriage) of Queen Elizabeth II to Prince Philip, Duke of Edinburgh.
The reverse was designed by John Bergdahl, and the obverse by Etienne Millner. The Royal Mint says about the design:
"To have fallen in love completely and unreservedly makes all one’s personal troubles and even the world’s seem small and petty." Written by Philip in 1946, these words demonstrate the strength of his love for Princess Elizabeth, which inspired him when designing her engagement ring. Diamonds from his mother’s tiara were set in platinum and The Queen still wears the ring to this day.
Etienne Millner’s combined portrait graces the obverse, while John Bergdahl’s double shield design features the heraldic lineage of the two families that became entwined when the couple married.
The coin is made of Platinum and weighs one quarter of an ounce; it was issued boxed, in Proof FDC grade only (Royal Mint Product Code UK17PWQP, issue limit 1,275, issue price £485.00). | 
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