It will be held within RIBA's Jarvis Hall and is expected to attract around 250 international gemmologists, jewellers and diamond experts.
Organisers hope that combining the two events will encourage Gem-A members and students from around the world to network and make connections with their European counterparts.
James Riley, CEO of Gem-A, said: "The decision to host this year’s annual conference at RIBA Venues was a straightforward one. Not only is the venue spectacular in its design and conception, but the auditorium, social and dining spaces are ideal for the kind of conference we offer and will fully meet expectations of our students and members. We also look forward to inviting the FEEG delegates to join us in this spectacular venue as an exhibit of great British architecture."
Stephanie Ellrott, head of venues at RIBA, said: "We are delighted Gem-A chose RIBA Venues to host its annual conference and symposium. London is the ideal location for an international event of this kind and we look forward to helping organisers make the event a resounding success."
RIBA Venues is the conference and events arm of Royal Institute of British Architects.
More association event news:
• For more breaking news and in-depth features, sign up to C&IT Magazine's daily Newstracker here