Antique 1916 Edwardian 18ct Gold Pink Tourmaline & Diamond Bar Brooch by J.E.S, Chester during the transition from the Edwardian era to early Art Deco (circa 1916-1917). This elegant piece showcases exceptional period craftsmanship and carries a wealth of historical documentation stamped directly onto the metal. Design & Setting: The brooch features a central, step-cut rectangular light pink gemstone (resembling a pink tourmaline or pink sapphire) elegantly housed in a fine millegrain border. It is flanked on top and bottom by two geometric, lozenge-shaped settings, each platinum-topped and set with a delicate antique-cut accent diamond.Hallmarks & Provenance: The reverse of the brooch is fully and crisply hallmarked with a complete set of British stamps:Crown & '18': Guaranteeing solid 18-karat gold purity. Chester Assay Office Mark: Features the historic three wheat sheaves and a sword crest (an office closed since 1962, highly collectible).Date Letter 'q' (or 'r'): Pinpointing the exact year of manufacture to 1916/1917 (WWI era).Maker's Mark 'J.E.S': Stamped inside a cartouche, identifying the piece as the work of the renowned British jeweler James Edward Smith (or Joseph Edward Sydenham).Additional Stamps: The pin and hinge mechanism also bear individual "18" stamps, confirming all components are original and solid 18ct gold.Specifications:Material: Solid 18ct Yellow Gold (with platinum accents on the diamond settings)Length: 5.0 cm (approx. 2 inches)Weight: Approx. 3.0 gramsCondition: Excellent antique condition with minor age-appropriate patina. The pin mechanism and C-clasp are original, fully functional, and secure. The central stone is secure in its setting with sharp facets.Note: The central gemstone has not been laboratory tested for natural vs. synthetic origin, which was customary and highly fashionable for fine gold jewelry of this specific era.A rare, fully hallmarked piece of British jewelry history, perfect for serious collectors of Edwardian, Art Deco, or Chester gold. Width 50X7X4 mm 3 grams