Art Deco diamond pendant necklace, circa 1910, property from a private collection, terminating on a swing drop millegrain-set with an old European-cut diamond weighing approximately 1.58 carats, surmounted by a similarly set diamond between an openwork geometric plaque decorated with rose and old mine-cut diamonds, the small diamonds together weighing approximately 0.42 carats, completed by a fine trace chain, mounted in platinum, inner circumference 400 mm, pendant length 44 mm., accompanied by a Heinrich Mau Hofjumelier Dresden fitted box., Provenance, Mrs Elisabeth Roesch, Dresden, Kingdom of Saxony. Private Collection, Sydney, by descent from the above. Other Notes: in late 19th century Vienna, Heinrich Mau was a renowned Hofjumelier, or court jeweller. He served as an official supplier of jewellery to Austro-Hungarian court, creating exquisite pieces for the Royal Family and aristocrats. Mau was known for his exceptional skill in crafting jewellery using precious gems and metals, and his pieces were highly sought after by the elite of Vienna and beyond. Mau's legacy as a master jeweller continues to this day, with his designs being highly valued by collectors and his name recognized as synonymous with the height of Austrian jewellery-making craftsmanship.