Gemmological Association & Gem Testing Laboratory, London opening hours

27, Greville Street, London, Greater London England, EC1N 8TN

19 Greville St, London, Clerkenwell, Greater London England, EC1N 8SQ

David Croft House, 25 Ely Pl, London, Greater London England, EC1N 6TD

Audrey House, 16 -20 Ely Place, London, Clerkenwell, Greater London England, EC1N 6SN

128 City Road, London, Greater London England, EC1V 2NX

106-109 Saffron Hill, London, Bloomsbury, Greater London England, EC1N 8QS

88-90 Hatton Garden, London, Greater London England, EC1N 8PN

70 Cowcross Street, London, Clerkenwell, Greater London England, EC1M 6EJ

70 Cowcross Street, Development House, London, Greater London England, EC1M 6EJ

70 Cowcross Street, London, Clerkenwell, Greater London England, EC1M 6EJ