It is heavily engraved 18 K White Gold with an octagonal crown securing the Aquamarine. It appears that the stone is a medium blue stone, which has been diamond cut in some variation of a round brilliant cut which explodes with brilliant scintillation when drenched in light. See how the medium blue color in photo 2, above, turns brilliant when side lighted in photo 3, above. The item "Men's Vintage Aquamarine Ring, 18 K White Gold" is in sale since Tuesday, March 17, 2020. This item is in the category "Jewelry & Watches\Men's Jewelry\Rings".
The seller is "oskydoodle" and is located in Roseburg, Oregon. This item can be shipped to United States.