An Art Deco 9ct gold, Garnet and Diamond large Cluster ring

Art Deco 9ct Gold Large Cluster Ring with a large Garnet surrounded by ten matched surrounding Garnets to outer edge and narrow band of Diamonds between the Garnets. Hallmark of  375  to inner side, confirming the 9ct Gold  Quality, plus  GJ, Designer Initials? and   375, confirming Gold quality again on the smaller Hallmarks. Excellent condition all over, quality Gems, with no damage or repairs, just a soft age patina, Dimensions approx.: Ring size   R  or  8 ¾ ; Gold Band 1mm wide at rear, to 5mm wide at divided upper Shoulder; band thickness 1mm thick generally to 3mm at divided side shoulder; Europe.