This is such a cute little thing!
A 15ct gold T bar with pearl ends. Perfect for elevating a finer chain, or adding into a stack. 
The bar fully swivels, if you need something to fiddle with! 
 
Tested as 15ct gold (ever so slightly rosy in hue) 
Weight approx 1.51g
Total drop approx 13mm
Width approx 23mm
Excellent antique condition