Ring with fine Burma ruby, approx. 2.6 ct, not heated

Ring with Burma ruby ca. 2.6 ct, no heat, surrounded by 16 diamonds in various cuts, total ca. 1.0 ct, ca. TIW-TIN (K-M)/SI-P, WG 18K and platinum 6 g, ring size 55, ruby ca. 9.4 x 8.5 x 3.55 mm, 20th century, good condition. Gübelin certificate from 12/2021 enclosed. Handcrafted.