1.83克拉橢圓形巴西天然亞歷山大變色石與鑽石戒指, 附Gübelin證書

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