With jeweller's mark for Michael Youssoufian
Accompanied by report no. GRS2011-071218 (duplicated with modifications) dated 20 August 2012 from the Gem Research Swiss Lab stating that sixteen oval-shaped rubies tested shows no indication of thermal treatment. Also accompanied by an appendix stating that thirteen rubies are of Mozambican origin, two of Tanzanian origin and one with unknown origin
Accompanied by report no. GRS2011-071218 (duplicated with modifications) dated 20 August 2012 from the Gem Research Swiss Lab stating that sixteen oval-shaped rubies tested shows no indication of thermal treatment. Also accompanied by an appendix stating that thirteen rubies are of Mozambican origin, two of Tanzanian origin and one with unknown origin