It appears to me that your ring is from the Art Deco period (1920's), I base this on the stone size, surrounding enamel detail, use of green and black enamel, and additional embossing on the sides as well as the wear noted on the mounting. The central stone may be carnelian or a good substitute. If there are markings inside the shank, they would provide further clues.
Your observation that the ring has elements of Egyptian revival styling seems accurate. the discovery of King Tut's tomb in 1923 was a sensation and greatly influenced jewelry styles.
The colored bits around the bezel look more like inlaid stones than enamel to me. The fractured/chipped areas suggest a thicker material than the enameled finishes I’m familiar with. But as kgizo said, it’s hard to tell from pictures.