Type of jewel: French vintage antique 1900s Art Nouveau diamond ring Condition: In well-preserved condition, especially given the jewel`s age. Country of origin: France Style: Vintage 1900's Art Nouveau Style characteristics: Art Nouveau - The floral ornaments and botanical designs are very typical for the Art Nouveau style. Also the use of curvilinear lines (the so-called the so-called whiplash motif) is typical for this period. Era: ca. 1900 Theme: This kind of ring is designated in French by the name 'tourbillon' which translates in English to 'twirler', 'twister' or 'whirlwind', obvious because of its original design. Material: 18K yellow gold and details in white gold or platinum (touchstone tested) Diamond(s): Nine senaille and rose cuts. A senaille is a simplified rose cut diamond, a small diamond chip with perhaps a few polished facets. - We understand that private buyers may expect diamond weights to be provided, but in the case of rose-cut or senaille diamonds, this is simply not standard practice among industry professionals specialising in antique and vintage jewellery. Unlike brilliant-cut diamonds, where weight correlates with diameter, rose cuts vary in thickness, making weight estimation impossible once set. Providing such figures could lead to unnecessary debates, as rose-cut diamonds were traditionally valued for their visual effect rather than intrinsic worth. Even major auction houses like Sotheby’s and Christie’s rarely list their weight, except for exceptionally large stones, where diameter is often provided instead. - All diamonds, regardless of their size or shape, in our vintage and antique jewellery are verified as 100% natural by the IJGC laboratory. Birth and month stones: Diamond is the birthstone (or month stone) for April. Hallmarks: The French control mark for 18K gold representing a horse's head that was in use in France from about 1838. Dimensions: band width top of ring 1,10 cm (0,43 inch) - See picture with a ruler in cm and inches Weight: 3,00 gram (1,93 dwt) Ring size: EU-55 & 17½, USA-7¼, UK-O Ring sizes are professionally measured and rounded to the nearest millimetre; slight variations are standard and do not affect wear. Adin reference Nº: 26089-0317 - All jewels are delivered in an Adin jewellery box. Boxes shown in photos are display props unless stated otherwise. - Every piece is accompanied by an Adin certificate of authenticity for your piece of mind. Adin has specialised in antique and vintage jewellery in Antwerp for over four decades. We maintain professional memberships and affiliations that reflect our ongoing commitment to standards, research, and responsible trade practice. - Shipped insured and registered. Collection in person is also welcome. - 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 pieces: https://auction.catawiki.com/lotsfrom/Adin - Antique and vintage jewellery may show evidence of past repairs or restoration, reflecting normal wear and period use. We present pieces in an authentic state and do not routinely remove surface marks or apply rhodium plating to white gold. If you prefer a brighter finish, you may choose a cosmetic refresh by a local goldsmith.