Vintage Mexican Sterling Silver Filigree Flower Onyx Ring 7.25

Beautiful Mexican Sterling Silver Onyx ring with filigree flower design or they could be seen as filigree fancy hearts around a central oblong loval stone. Bears hallmarks of 925 Mexico and some other hallmarks I am trying to deciper. See photos. Appears to be from the 90s. Beautifully crafted. Thin and dainty and perfect that gypsy or southwestern look. Measurements - size 7.25 diameter is 17.5 mm - ring chart indicates size 7.25. This ring is pliable so you will be able to form it to your finger if it is off a little.