Corvidae Antique has dated this piece to the Victorian era.
Victorian jet, now extremely collectible, largely comes from the English seaside town of Whitby - not to be confused with "French jet", which is actually black glass.

Jet was popularised by Queen Victoria, who wore only black mourning jewellery following the death of her beloved husband Prince Albert in 1861. Jet was expensive - both limited in supply and requiring skilled craftsmanship to carve without breaking - and popular cheaper alternatives included gutta percha, vulcanite and bog oak, as well as onyx.

The necklace closes with a substantial nine-carat gold springring clasp in good working order.
One bead has a chipped edge (see photos) but the necklace is otherwise in excellent antique condition, with no other chips or cracks we've found.
Length: Approximately 29 inches.
Size: The beads range in size from approx 1cm to 1.5cm.
Weight: 58.8g.
Corvidae Antique has dated this piece to the Victorian era.
Hand picked jewellery from a friendly family business
You can view the stock and full dealer information on the Corvidae Antique Profile Page