Really pretty mid 19th Century key pendant. 
The key is made from high carat gold, the top circle of the key (bow) set with rose cut diamonds and decorated with dark navy enamel inbetween the stones.
The stem of the key is decorated with tiny diamonds, set in silver, the right edge accentuated with a gold rope twist detail.
The key 'bit' is yellow gold and set with thirteen old cut diamonds, and looks rather 'axe like' 
The pendant has an 18 carat gold jump ring looped through the bow, ready to hang from a chain.
 
measures - 35mm x 13mm wide
weighs - 2.4g
Mid 19th Century european
Condition - good antique condition