What an incredible Bracelet! Lucky you. I agree with Yvonne, ca. 1930s when Art Deco went American and "streamlining" was being used as an aesthetic on almost everything called "object' to give it a technological touch.
The color of coral cab is quite orange. I like this color myself- it 's what you imagine the color of coral to be. True to name. Apparently I've read though, the most prized corals are an oxblood red and the angel-skin pink; after seeing your beautiful bracelet I have no idea why. Beware of imitations. To test for coral, place the coral in a glass of milk, it should turn pink. Kindest Regards June
Congratulations! What a fantastic antique bracelet, no doubt very avante-garde in the early 1900s. Thank you for attaching photos. The orange stone is an oval Coral cabochon, which could be genuine. FYI Coral was popular throughout the Victorian era. The antique gold work (engraving process) on the surface around the centre coral seems to be anticipating the Art Deco geometry but it's the machine aesthetic in this piece that wins the prize.
I'm leaning towards the early 1900s when Jewelers associated with the French Art Deco including Jean Fouquet and Raymond Templier, were experimenting with basic geometry, the smooth surfaces of squares and sharp edged angles. Dubbed 'domesticated Cubism' by design historian Bevis Hillier, it was inspired from the geometry that was appearing in the paintings of the Italian Futurists who were operating in the cities of Milan and Turin just before WWI.
The use of the chevron shape, which reflected a sense of wonder at the technology that was changing the world was also introduced during this time.