Golden Antique ring

Vintage gold 585’ ring with some gem stones. Stones look a bit over aged, but gold is in great condition. Lovely intricate pattern, although hard to build a size number, as it shaped as oval. 18mm x 21mm approximately inside mms. Not sure about the maker, but I would guess it’s the third person, mentioned below, as my grandmother lived in Germany, and this is where is that ring from. “The letters "F.B." most likely represent a maker's or sponsor's mark, identifying the manufacturer, designer, or company that submitted the item for hallmarking. This is a common practice in the jewelry industry to ensure authenticity and trace the origin of the piece. Specific potential makers for the "F.B." mark include: - Faye Benjamin Jewellery: A UK-based jeweller whose sponsor's mark is F.B. and a bow-tie shape; - Farber Brothers: Mentioned as a potential maker, though they appear to work with silver and gold combinations; - Franz Breuning: A German manufacturer from Pforzheim that works in gold, silver, and bronze” “Franz Breuning was born in Hanau (Main) on March 15, 1901, as the third child of the jewelry wholesaler Thomas Breuning. 26 years later, in 1927, he founded the jewelry company "Franz Breuning" on Rudolfstraße in Pforzheim with six employees and in the subsequent decades, the company gained international renown”