An unusual sapphire and diamond ring

An unusual sapphire and diamond ring, the octagonal cut sapphire changes from violet to blue and is set with two baguette shaped diamonds in platinum. Size S. With report number 05773 from the Gem and Pearl Laboratory dated 1st June 2012 stating that the natural sapphire measures 10.3 by 9.2 x 5.4mm and is of Sri Lankan origin. The sapphire appears blue in daylight and purple in incandescent light.