Dates to the Edwardian era, circa 1901.
Crafted in solid 14K yellow gold, and hallmarked with the Alling & Co (Newark, New Jersey) hallmark upon the back.
Featuring a carved 'Rock of Gibraltar', set into a gold bezel. As the real Rock of Gibraltar is limestone, I assume that this smaller version also is, as it consists of a light weight grey rock.
The stickpin measures 2.44" from top to bottom, with a top portion of 0.56" by 0.58". This piece weighs 3.1 grams.
Condition is very good, with no damages or repairs.