Alexandrite Description - GIA
This 7.19-carat alexandrite was cut to feature its beautiful color change. When the light source changes from daylight to incandescent light, the gem’s color changes from bluish green to …
Alexandrite Gemstone | Natural Alexandrite Stone - GIA
Fine alexandrite is green to bluish green in daylight and red to purplish red in incandescent light.
Alexandrite Quality Factors - GIA
Fine alexandrite is green to bluish green in daylight and red to purplish red in incandescent light. Its color saturation is moderately strong to strong. Stones that are too light do not reach the …
“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated ... - GIA
Red chrysoberyl has intense coloration and appears very dark violet-purple to purple in daylight and reddish purple to red-purple in incandescent light. Explaining the lack of green-blue …
Geographic Origin Determination of Alexandrite
Jan 31, 2020 · Brazilian alexandrites tend to have a bluish green component in daylight-equivalent lighting and a reddish purple to purple component under incandescent light. The color-change …
Pleochroism and Color Change in Faceted Alexandrite: Influence of …
Jul 31, 2015 · For alexandrite in particular, the goal of gem cutters and merchants for decades has been the “best” color change, defined as a green or bluish green to blue-green color in …
Alexandrite - Gemological Institute of America
Alexandrite can change colors under different kinds of light. For example, it can be green in daylight but can change to a brownish or purplish red under a lamp. This is because it is a …
Dramatic Color Zoning in Alexandrite | Gems & Gemology
Jan 31, 2020 · An 8.55 ct alexandrite was recently submitted to GIA’s Bangkok laboratory. Standard gemological testing yielded a refractive index of 1.745–1.754 and a specific gravity …
babwe demonstrate a striking alteration from dark green and blue-green to pure or violetish red. Sri Lanka has been and still is the most important producer of alexandrite. The colors seen in …
Garnets from Madagascar with a Color Change of Blue-Green to …
The alexandrite-like color change from blue-green in daylight to purple in incandescent light is mainly caused by relatively high amounts of vanadium (about 1 wt. % V 2 O 3). These garnets …