The safety pin was patented in 1849, although it was just a more sophisticated version of the Bronze Age pins, and is used for some brooches.
Another clasp that began to be used about 1880 is the cone-shaped clasp, like a thicker C-Clasp, which offered more security to the wearer.
Lever safety clasps, locking C-clasps, were used at the end of the century.
The safety clasp, similar to what is used today, came in around 1910.
Hinges, too, finally changed towards the end of the 19th century. Ball hinges came in around 1890 and riveted hinges around 1900.
One piece pin mechanisms with safety catches came in around 1937.