The historic origins of wedding anniversaries date back to either the Holy Roman Empire or medieval Germany, when husbands crowned their wives with a silver wreath on their 25th anniversary and a gold wreath on the 50th.
The symbols have changed over time. For example in the United Kingdom, diamond was a well known symbol for the 75th anniversary, but this changed to the now more common 60th anniversary after Queen Victoria's 60 years on the throne in 1897 was widely marked as her Diamond Jubilee.
Later, principally in the 20th Century, commercialism led to the addition of more anniversaries being represented by a named gift. The origins of the current gift conventions date to 1937. Before that, only the 1st, 5th, 10th, 15th, 20th, 25th, 50th, and 75th anniversaries had an associated gift.