Mitaine has dated this piece to the Victorian era.
The rich tortoise shell varies in colour, with wonderful shades of deep brown marbled with amber and caramel hues on the chain the locket being darker. At the centre of the pendant is a raised 3-dimensional design resting above the smooth surface. The image depicts a knight overlapping set of initials (appearing to be "D.M.") that are textured with hand-carved detail. A beautiful and unusual Victorian piece, it is comfortably lightweight so is easy to wear.

This dates from the late19th century and there are many in museums. As shown below.
https://www.metmuseum.org/art/collection/search/16824
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Mitaine has dated this piece to the Victorian era.
Specialises in antique fine jewellery
You can view the stock and full dealer information on the Mitaine Profile Page