{"product_id":"rayner-chelsea-colour-filter-1978","title":"Rayner Chelsea Colour Filter 1978","description":"\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003eIn October 1961, \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eMessrs. Rayner \u0026amp; Keeler Ltd.\u003c\/span\u003e\u003c\/span\u003e entered into a formal distribution agreement with the \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eGemmological Association of Great Britain\u003c\/span\u003e\u003c\/span\u003e (GAGB), whereby the Association was appointed worldwide distributing agent for all Rayner gemmological instruments and accessories, as announced in \u003cem data-start=\"461\" data-end=\"487\"\u003eThe Journal of Gemmology\u003c\/em\u003e, Vol. 8, No. 4 (October 1961). Under this arrangement, Rayner discontinued direct retail sales and concentrated on manufacturing at its Sussex factory, while GAGB managed global distribution. Rayner instruments—including refractometers, spectroscopes, and later models of the “Dialdex” refractometer—were widely regarded for their professional quality. This formal partnership represents the clearest documented institutional relationship between the two bodies, combining Rayner’s manufacturing expertise with the Association’s international educational and trade network.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eArchival instrument listings in \u003ci\u003eThe Journal of Gemmology\u003c\/i\u003e from 1978 and 1980 show that companies including Rayner and Gemmological Instruments, Ltd. listed the Chelsea Colour Filter alongside other equipment such as refractometers, dichroscopes, and spectroscopes. These are typically the back-of-book instrument catalogue sections that gemological publications used to distribute annually.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThis is a museum archives and no unit is available for sale at this moment. \u003c\/span\u003e\u003c\/p\u003e","brand":"Gems.studio","offers":[{"title":"Default Title","offer_id":51552581878080,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0397\/2672\/files\/Rayner_1_83cfbce2-7128-4900-970e-b4acdf690e92.gif?v=1771661914","url":"https:\/\/gems.studio\/products\/rayner-chelsea-colour-filter-1978","provider":"Gems.studio","version":"1.0","type":"link"}