Natural ruby set in mother of pearl base, embellished with gold accents. Hallmarked for Imperial Russian Gold. Later rehallmarked 585 for 14K European gold, presumably during soviet period. Total weight is 8.65g. Diameter of mother of pearl circle is approximately 0.6 in diameter.Some wear to one cufflink, as pictured. Perhaps a natural defect in the mother of pearl, but we thought we'd mention it anyway. A very rare and beautiful item indeed.