Type of jewel: Vintage antique diamond and navette sapphire ring Condition: In well-preserved condition, especially given the jewel`s age. Style: Vintage antique Era: ca. 1910 Material: 18K reddish/yellowish gold (touchstone tested) - It's difficult to pinpoint the exact hue of this gold; it falls somewhere between red and yellow. Diamond(s): Sixteen senaille and rose cuts. A senaille is a simplified rose cut diamond, a small diamond chip with perhaps a few polished facets. - All diamonds, regardless of their size or shape, in our vintage and antique jewellery are verified as 100% natural by the IJGC laboratory. Precious stone(s): One natural sapphire with an estimated weight of ± 0.58ct. - It is common practice to treat gemstones to enhance their clarity or colour. This item has not been tested for such treatments. - All gemstone weights are approximate, as the stones are not removed from their settings to preserve the integrity of the piece. Birth and month stones: Diamond is the birthstone (or month stone) for April and Sapphire is the birthstone (or month stone) for September. Hallmarks: "18K" suggesting 18K gold Dimensions: width across the ring head 1,82 cm (0,72 inch) - See picture with a ruler in cm and inches Weight: 2,30 gram (1,48 dwt) Ring size: EU-54 & 17¼, USA-6¾, UK-N Ring sizes are professionally measured and rounded to the nearest millimetre; slight variations are standard and do not affect wear. Adin reference Nº: 26106-0260 - 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.