An impressive unmounted 118.88 carats Burma 'Royal Blue' sapphire. Estimate CHF3,100,000 – CHF3,600,000 ($3,197,654 - $3,713,405). Photo Christie's Image Ltd 2015

The cushion-shaped sapphire weighing approximately 118.88 carats, in blue leather fitted case

Accompanied by report no. 14038086 dated 29 March 2014 from the Gübelin GemLab stating that the origin of the sapphire is Burma (Myanmar), with no indications of heating, and a colour variety that may be also called 'Royal Blue' in the trade, also with an Information Sheet on 'Unheated sapphires' and an Appendix indicating that 'The 118.88 ct natural sapphire (...) possesses a combination of outstanding characteristics. It displays a homogeneous and richly saturated royal blue colour, which typifies the finest of these gems. The depth of colour, combined with a high clarity and brilliance, all contribute to the beauty of the gem.' 

Premium Appendix no. 73209 dated 11 March 2014 from the SSEF Swiss Gemmological Institute stating that the origin of the sapphire is Burma (Myanmar), with no indications of heating, and a colour that may also be called 'Royal Blue' in the trade, and an Appendix letter on this exceptional sapphire 

CHRISTIE'S. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva