Item: Vintage Gold Filled Amethyst Belcher Oval Photo Locket Necklace. There are no stamps or marks on the locket. It looks gold filled to me. The chain is 1/20th 12K GF. The amethyst was tested using a Presidium Gemstone tester.
 
Measurements: The oval measures 3/4 X 5/8th of an inch. Total length with bale is 1 inch. The chain is 17 & 1/2 inches long. 
 
Condition: Vintage, previously owned. There are only very minor signs of age/use/patina.