An 18ct yellow gold and diamond solitaire ring, the slightly oval faceted cut stone approximately

An 18ct yellow gold and diamond solitaire ring, the slightly oval faceted cut stone approximately 1.9ct, 7.7 by 7.4 by 5.0mm, in a white gold four claw setting, unmarked but testing as 18ct gold, band 2.0mm, 7.5mm from inside band surface to the diamond table, size T, 3.5g.