Let's take a little dive into the world this beautiful necklace has come from.
Made by Wales & McCulloch who were a clock, watch and jeweller manufacturer based around Ludgate Hill in London. This was quite the hub for various watchmakers and quite prominent location for the industry during the 19th-early 20th centuries.
Wales & McCulloch were established 1853 & incorporated as a Ltd trading company in 1908 until 1934. From this information and their various addresses, we can gather the necklace, or at least the box - which was made to fit the necklace was made between 1885-1918. The box is labelled with the addresses '56 Cheapside & 20 Ludgate Hill London'. The Ludgate Hill address disappeared from advertising around 1918.
So there's a little snippet of history about this beautiful piece. Even if there's not a lot of information to find it's always nice to be able to have a general idea of when it was created.
Sources:
https://en.wikipedia.org/wiki/Wales_%26_McCullochhttps://blog.mcculloch.scot/2021/02/wales-mcculloch.html