Petra-Siberia LLC
- 9/2 Himzavodskaya str., Berdsk, 633004, Russian Federation.
- web: www.petra-gems.com, email: petra@petra-gems.com
- Director: Igor Kovshik
- Head of international department: Olga Anikina
- email: anikina@petra-gems.com, tel: +7 913-799-9075, +852 5199-7025
- Sales manager: Gennady Kovshik
- tel: +7 914-386-8630
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