19th century old cut yellow sapphire ring

In Focus: A beautiful period setting, Likely handcrafted in Germany, featuring a radiant 19th-century unheated sapphire from Sri Lanka.   History:  Place of Origin: Germany Date Period: Circa 1880s   Ring Mount: Metal Composition: 18ct gold Hallmarks: Unmarked Ring Size: UK M / US 6 (Complimentary resizing available) Ring Weight: 4.3 grams   Stones: Sapphire: Weight, 5.16ct (weighed and polished) (10mm x 8.5mm x 6.5mm), Natural Unheated and sri-lankan a very good spread of yellow colour Diamonds: Weight Approximately, 0.25ct total  Dimensions: Face: 13.8mm (L) x 11mm (W) Setting Height: 6.2mm   General Condition: Excellent vintage condition with minimal wear. All stones are secure and the ring has been professionally cleaned and polished. Stone weights and measurements are estimated in the mount.