1.83克拉椭圆形巴西天然亚历山大变色石与钻石戒指, 附Gübelin证书

Accompanied by report no 12081123 dated 11 September 2012 from the Gübelin Gemmological Laboratory stating that the 1.83 carat alexandrite is of Brazilian origin, with no indications of treatment and displays a pronounced color-change from bluish-green in daylight to purple in incandescent light