18kt white gold ring with ruby

provenance Siam - Thailand, oval cut approx.1.40 ct surrounded by navettes cut diamondsapprox. ct 2.90 F / G color, - VVS / SI purity and brilliant cut diamonds approx. 3.40 ct H / J color - VVS / VS purity, size 8. Complete with I.G.N. gemological certificate n. 25584, peso 13 gr.