18K Yellow Gold Saddle Ring w Ox Blood Red Carnelian? Coral? Inlay ~5.4g

18K Yellow Gold Saddle Ring with Ox Blood Red Carnelian? Coral? Inlay ~5.4g Marked with Symbol Likely Asian This mesmerizing saddle ring is quite mysterious. A makers mark ID would be greatly appreciated from an aficionado. I have given up trying to ID it but not for lack of trying. It is definitely a special piece. Measurements:  Size 3 w/ the included ring sizer 7/8" W x 1" D x 1/4" H 5.47g Condition:  Very good vintage condition. Using the loupe, I can see minor scratches and wear on the gold commensurate with age and use. The ring has been lightly cleaned. Please see all photos.