This could be your everyday diamond pendant! We suspect it's a stick pin conversion but it came to us as it is.
Victorian 9ct Diamond Pendant
Era - Victorian
Size - See below
Dimensions - 14.4mm drop by 8.1mm wide
Hallmarks - None present
Weight - 1.5g
Materials - 9ct gold and diamond tcw approx 0.2
Other information - N/A
Very good antique condition, with light wear commensurate with age