Preowned In the Style of Konstantino Onyx Quatrefoil/Clover Silver Ring, Size 6

I purchased this item several years ago at a boutique. It is unbranded, in the style of Konstantino. A chunky statement piece, two-toned, with a black onyx clover/quatrefoil center design. There are 4 tiny gold-toned flowers placed at the corners of the quatrefoil. Thin back band. I was told it is sterling and it does have a mark stamped inside the band, but the 925 mark is blurry, please see pix. Good used condition, the setting has minimal wear and the onyx stone has no noticeable damage or wear.