WH Co antique Victorian 1/4 thick 10k gold filled paste rhinestones round locket

This locket is incredible shape and acid tests as solid 10kt gold however Wightman and Hough were known for their unusually high gold fill content of 1/4 (25%) as opposed to the standard 1/20 (5%) so to file deep enough to make a determination would damage this piece. Several spots were tested and apart from bail, results were positive for 10k every time. It also looks as though there may be an obscured purity mark present on the small bail/connective ring. Front is beautifully etched and embellished with 21 clear faceted glass gemstones. Locket clasp is strong and functions perfectly. Weight is 9.60 grams. Please see photos for measurements in inches. Tags: charm pendant miniature photo holder album keepsakes round puffed 1800s 1900s engraved engravings etched etchings faceted glass rhinestones jewels jeweled crystals gems gemstones embellished embellishments