Georgian Hessonite Garnet & Diamond Cluster Ring pink topaz and remains in fantastic condition

and remains in fantastic condition

and signed with the Tiffany maker's mark to the inner band

The third ring

in 1830 - the fourth and penultimate Hanoverian monarch

however a paper published in 2003 by Heaney and Fisher contests this:

Georgian Hessonite Garnet & Diamond Cluster Ring pink topaz and remains in fantastic conditionDATE: Georgian, c. 1810 A stunning and rare antique cluster ring dating from the Georgian period, circa 1810. The centrepiece is a gorgeous cushion cut, fiery hessonite garnet surrounded by a cluster of old mine cut diamonds. All of which rest in closed, foil backed, silver settings allowing the light to bounce back through the stones. The shank is a simple 15k gold knife edge band with split shoulders STONES Hessonite Garnet Approx. 2. 53 carat Old