{"product_id":"art-deco-day-night-eternity-ring","title":"Art Deco \"Day \u0026 Night\" Eternity Ring","description":"\u003cp\u003eCool Art Deco \"Day and Night\" eternity ring dating from the 1920s. The central band is set with vibrant blue sapphires and rubies, then two further bands are hinged along a central point, allowing them to be flipped and worn alongside either the red or the blue stones. Or, flip the whole ring around and wear just one band in one colour. It's crafted in sterling silver that's beautifully hand-engraved, and the stones are all corundum: ruby, white sapphire and blue sapphire - presumed, given the date, to be flame-fusion stones. \u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eFlame fusion (VFF) was the first technique (perfected by \u003c\/span\u003e\u003cspan\u003eAuguste Verneuil in the 1880s) that allowed for the creation of sapphires and rubies in the laboratory. The stones have an identical mineral make-up to naturally occurring sapphire (corundum, to use the correct mineralogical term): powdered aluminium oxide is passed through a super-hot oxyhydrogen flame, along with colouring metals (chromium, titanium, vanadium etc.), fusing them together in the specific crystalline structure of corundum. Over time, Verneuil's technique was honed and refined until precious gemstones of remarkable colour and clarity could be produced - at relatively low expense - for the jewellery industry. However, in this case, it must have cost a fair but in lapidary alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eEra: Art Deco, circa 1920\u003c\/p\u003e\n\u003cp\u003eStones: Corundum, variety Sapphire (Blue \u0026amp; White) and Ruby. Assumed Verneuil Flame-Fusion (lab-grown) stones.\u003c\/p\u003e\n\u003cp\u003eRing size: K or 5.25 US. Not resizable.\u003c\/p\u003e\n\u003cp\u003eWidth of band: 3mm\u003c\/p\u003e\n\u003cp\u003eMarks: None, tested as sterling silver\u003c\/p\u003e\n\u003cp\u003eCondition: Great antique condition; light wear consistent with age.\u003c\/p\u003e","brand":"Lost Heirloom","offers":[{"title":"Default Title","offer_id":53020059205944,"sku":"LO3196","price":435.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/7387\/2952\/files\/Website-6560.jpg?v=1790340978","url":"https:\/\/lostowl.com\/products\/art-deco-day-night-eternity-ring","provider":"Lost Owl Jewelry","version":"1.0","type":"link"}