Mid-Century 1.83ct Sapphire & Diamond Square Signet Ring gaming token and bears Chinese hallmarks behind

and bears Chinese hallmarks behind the head

with the exception perhaps of the 1900s

and this is one of the best I've seen

It's crafted in silver and bears French assay marks

Mid-Century 1.83ct Sapphire & Diamond Square Signet Ring gaming token and bears Chinese hallmarks behindDATE: Mid Century, c. 1950 Architectural 1950s square signet ring set with a vivid, velvety blue sapphire within an old cut diamond border. The design is particularly striking, making use of contrast at both the macro and micro levels: oval sapphire within square border, millegrain edges giving way to a broad, tapered shoulder polished to high shine, pierced triangle motifs around the extent of the gallery. It would make an excellent gents pinky ring,