Let's see. I should know how this works. A 25th anniversary is a 'silver' anniversary. After 50 years, one graduates to a 'gold' anniversary. Queen Victoria started her reign in 1837, so 1897 is a full 60 years. Amazing. It deserves a 'diamond' designation. This medal, which is struck not in silver or gold but in low-value white metal, commemorates the diamond jubilee of Queen Victoria's long and fruitful reign. She went on, by the way, for another three years as queen!
Medals are not as valuable as coins because there are far fewer medal collectors as coin collectors. Nevertheless, a nice, well-preserved example of Queen Victoria's diamond jubilee medal will command strong value from medal collectors. A guess at typical values runs like this:
worn: $5 US dollars approximate catalog value
average circulated: $10
well preserved (like our picture): $30
fully uncirculated: $120
Apply the concepts on our Terminology page to convert these catalog values to actual buy and sell values.