Testing instruments
Gem-A Instruments (Gemmological Instruments Ltd), the trading arm of The Gemmological Association of Great Britain
The instruments shop of the UK gemmological association, selling both own-branded and third-party bench instruments.
The record
Kind of equipmentTesting instruments
BasedLondon, United Kingdom
Founded1908
Price, as listedPrices are published in pounds sterling excluding VAT, ranging from single figures for small accessories to around GBP 1,577 for the most expensive listed instrument.
StatusTrading
What it makes
Named as the maker names them on its own site. Specifications and availability change; confirm with the maker before ordering.
Gem-A RefractometerGem-A Diffraction Grating SpectroscopePresidium Refractive Index MeterPolariscopesTravel and LED zoom microscopesLoupesDial, electronic and computer gaugesColour filtersLight sources and torchesStone testersHearts and arrows and girdle inscription viewers
Worth knowing
The founding year of 1908 is that of the Gemmological Association of Great Britain, stated on its own site; the shop trades as Gemmological Instruments Ltd from 21 Ely Place, London. It is a reseller as well as an own-brand supplier, so some catalogue lines are other makers' products.
Compiled from shop.gem-a.com, read on August 16, 2026.
We record what makers publish about themselves. We have not tested this equipment, we take no commission on it, and a listing here is not a recommendation to buy.