Oversized round sterling silver ring with 2 colors of Baltic Amber stone. Size 9

Absolutely stunning huge oversized round sterling silver ring with 2 colors of Baltic Amber stone. Signed AG 925. Could be Tiffany(?). Large statement designer dinner ring. The amber circle is 1.5''wide. Size 9 (18.5mm diameter). Heavy weight (31g). Silver part has some surface scratches. Overall is good condition.