Circa 300-400 AD.An impressive oval amethyst intaglio of a draped bust of Sol Invictus with radiate crown in a fine closed back set setting with intricate filigree wirework and grains, on the flat thick shank with the same repeating patterned wirework. Sol Invictus translated as the 'unconquered sun' was recognised by the Roman empire as the sun god. Characterised by a crown of radiating beams, the ancient Romans looked to Sol as a powerful deity of warmth, light and strength and thus became the patron of soldiers. At the height of the sun god's popularity coins, jewels, festivities, and games were created in his honour. Ring is post Classical period. 22kt gold.Size: D: 20.3mm / US: 10 5/8 / UK: V; 7.4gProvenance: From the private collection; previously was acquired from G. M. in London in 2017.