Up for auction is a beautiful pair of vintage modernist men's cufflinks crafted by the renowned American artisan studio, Great Falls Metal Works. Design & Materials: Features a striking square, dark-patinated setting inlaid with genuine natural green malachite stones showing beautiful organic banding lines. Hallmarks & Authenticity: The backplates are clearly stamped with the official circular "GFMW" maker's mark, verifying their studio pedigree. Please note there is no separate "925" stamp, which is common for artisan studio pieces from this maker where the signature logo serves as the quality guarantee. sterling silver with a dark, oxidized finish.