The Diamond was a steamer that appeared on the Glasgow to Arran route in the summer of 1857, and the mystery was that she is recorded as having been built in 1853 by Messrs James Henderson at Renfrew. There is no record of a steamer named Diamond building on the Clyde that year, and so it seems likely that she was built under a different name. What was the name of the steamer? What had happened to her in the interim? Why was the name changed? The oft reported answer to these questions owes its provenance to a letter in the Glasgow Herald in the summer of 1897 that states “I am in possession of a list made out in 1856 or 1857 by a relative officially then connected with the shipping of the port. According to that list, the following river steamers had within the previous year or two left the river:—Mars, Invincible, Merlin, Reindeer, Baron (came back as Diamond in 1857), Dunrobin...