Rayner Chelsea Colour Filter 1978

In October 1961, Messrs. Rayner & Keeler Ltd. entered into a formal distribution agreement with the Gemmological Association of Great Britain (GAGB), whereby the Association was appointed worldwide distributing agent for all Rayner gemmological instruments and accessories, as announced in The Journal of Gemmology, 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.

Archival instrument listings in The Journal of Gemmology 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.

This is a museum archives and no unit is available for sale at this moment.