Antique Victorian Engraved Locket Gold Filled

Antique Victorian yellow gold filled locket. It is marked GF on the back but I do not know what karat the gold is. It is hand engraved in a floral design. The back side has a monogram. 

Measures 1" tall without the jump ring. It is 3/4" wide. Photo openings are 17mm by 12mm. They still have thin plastic photo protectors. 

Weight: 4.5 grams.