platinum 1911-1940 platinum Art Deco jadeite and diamond ring from Pragnell Vintage featuring jade, brilliant cut diamonds and circa 1911-1940. Normal everyday use and external agents may reduce the lustre of gemstones and gold surfaces. To maintain, use specific, non-abrasive products specially meant for cleaning jewellery.. POSITIVELY CONSCIOUS: Purchasing this item continues its narrative and reduces the environmental impact of using new resources. You can be confident that you’re making a better choice for the Planet..