Antique jewelry object group ring (most probably "born" as collar stud and somewhere in its life changed to this ring) Condition very good condition Country of origin unknown Style Art Deco - Art Deco is an eclectic artistic and design style which had its origins in Paris in the first decades of the 20th century. The style originated in the 1920s and continued to be employed until after World War II. The term "art deco" first saw wide use after an exhibition in 1966, referring to the 1925 Exposition Internationale des Arts Décoratifs et Industriels Modernes that was the culmination of high-end style modern in Paris. Led by the best designers in the decorative arts such as fashion, and interior design, Art Deco affected all areas of design throughout the 1920s and 1930s, including architecture and industrial design, as well as the visual arts such as painting, the graphic arts and film. At the time, this style was seen as elegant, glamorous, functional and modern. See also: Art Deco Style specifics Abstract motives and geometrical forms are quite typical for the Art Deco period. Period ca. 1920 Material Two tones of precious metal, the main part being 18K yellow gold and the white parts are either white gold or platinum. (touchstone tested) Technique Enamelling is an old and widely-adopted technology. The ancient Egyptians applied enamels to pottery and stone objects. The ancient Greeks, Celts, Russians, and Chinese also used enameling processes on metal objects. Enamel is the colorful result of fusing powdered glass to a substrate by firing, usually between 750 and 850 degrees Celsius. The powder melts and flows and hardens to a smooth, durable vitreous coating on metal, glass or ceramic. According to some sources, the word enamel comes from the High German word smelzan (to smelt) via the Old French esmail. Used as a noun, "an enamel" is a usually small decorative object, coated with enamel coating, such as a champlevé or a cloisonné (different techniques). Diamonds 25 rose cut diamonds and senailles . A senaille is a simplified rose cut diamond, a small diamond chip with perhaps a few polished facets. We do not have the weight of the rose cuts diamonds nor the senailles which is normal in our trade when it comes to rose cut diamonds and senailles. All diamonds we offer are screened by the I.J.G.C. for whether they are natural or synthetic, and all diamonds in this jewel are 100% guaranteed to be natural. Birthstones Diamond is the birthstone (or month stone) for April. Hallmarks No trace. Dimensions diameter top of ring 1,40 cm (0,55 inch) Weight 3,90 gram (2,51 dwt) Ring size Continental EU: 50 & 16 , Size USA: 5¼ , Size UK: J½ Adin Reference Nº 22236-0281 - Accompanied by a professional report of authenticity for your peace of mind. - Shipped insured and registered for your security, though you're most welcome to collect in person. - For shipments outside the EU, import duties and other charges may apply. We advise checking this in advance. - We invite you to browse through our customer feedback to discover the level of satisfaction we consistently provide. - See more of our products, visit: https://auction.catawiki.com/lotsfrom/Adin - Antique and vintage jewellery often undergoes thoughtful refurbishment, remodelling, or repairs to enhance its longevity and wearability. Such pieces frequently bear marks of this tender care. Furthermore, we present our antique and vintage jewellery in its authentic state, refraining from removing scratches or applying rhodium plating to white gold items. Our priority is to preserve the genuine allure and history of each piece. However, as the new owner, you have the option to take it to a local goldsmith for a cosmetic refresh, should you choose.