Edwardian Diamond Openwork Swirl Ring Size:5.75 the base is green with

the base is green with gold rim

The two smaller stones are arranged in a classic crossover "Toi et Moi" arrangement

while others believe it was based on  the astronomical clock at Exeter Cathedral which had a small hole in the door below the face for the resident cat to hunt mice

serialised in The Strand Magazine from December 1900 to August 1901

Edwardian Diamond Openwork Swirl Ring Size:5.75 the base is green withDATE: Edwardian, c. 1910 A cute diamond swirl ring dating from the Edwardian period, circa 1910. It's set with a cluster of old European cut diamonds and the band is crafted in 18 karat yellow gold. With platinum openwork millegrain settings, creating a swirl like pattern, with four square settings in the centre. STONES Old European Cut Diamonds MEASUREMENTS Head: 11. 1mm diameter Rise off finger: 4. 2mm Width of band: 1. 8mm WEIGHT 3. 2g MARKS