An emblem of honor worn on one's clothing
A gold medal was awarded for a harvester and self-binder (McCormick's).
In 1921 he was awarded the gold medal of the Society of Arts, London.
For his work on etherification Williamson in 1862 received a Royal medal from the Royal Society, of which he became a fellow in 1855, and which he served as foreign secretary from 1873 to 1889.
In recognition of this work the medal of the Royal Astronomical Society was awarded him in 1833.
The Copley medal was conferred upon him in 1823, and the Lalande prize in 1817 by the Paris Academy, of which he was a corresponding member.