Large ring of 18k gold set with a blue stone

Large ring of 18k gold, set with a blue stone. Ring size 68. Measure of the stone: 1,2 cm x 1,5 cm. Stamped "750" Antik Damgaard-Lauritsen acquires gold, silver, and jewelry – both for resale and remelting. We believe it is a shame to melt the Danish cultural heritage