The Vintage Wrist Watch Company has dated this Rolled Gold Albert Chain to the 1890s.
There are a couple of chips to the edge of the stone.

The chains measures 22cm and 23cm including the clasps and the T-bar. There is a link that states the chain is, ‘warranted 18ct rolled gold’.
The fob measures 22mm high, and the flat surface measures 20mm x 10mm.
Total weight 49g.
The Vintage Wrist Watch Company has dated this Rolled Gold Albert Chain to the 1890s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page