安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Pleochroism in Faceted Gems: An Introduction | Gems Gemology - GIA
Describes the phenomenon of pleochroism and its complex effect on the appearance of colored stones
- Pleochroism and Color Change in Faceted Alexandrite: Influence of . . . - GIA
The color appearance of faceted gemstones is a complex subject, and the challenges are increased if the material is biaxial and pleochroism is added to the considerations
- Special Colors and Optical Effects of Oregon Sunstone: Absorption . . .
The pleochroism in natural Oregon sunstone appears much stronger than in copper-treated feldspars, indicating higher aspect ratios of the copper particles, likely due to a slower cooling rate
- Iolite Gemstone | Iolite Stone – GIA
Iolite displays different colors when viewed in different directions Iolite is usually faceted to highlight its transparency Iolite’s finest blue color can rival tanzanite’s vivid hue Iolite’s pleochroism can be a challenge for cutters The mineral cordierite is known as iolite in the jewelry industry
- Tanzanite Description - GIA
Tanzanite's appearance is influenced greatly by its pleochroism, which is the ability of a gemstone to show different colors when viewed in different crystal directions
- Iolite Description - GIA
This silicate of aluminum, iron, and magnesium has two distinctive features—a beautiful, violetish blue through slightly violetish blue hue derived from iron and a striking, eye-visible pleochroism
- Pleochroism in Faceted Gems: An Introduction - GIA
In biaxial gems, pleochroism is displayed in a manner similar to that of uniaxial gems, except that there are three different pleochroic directions (X, Y, and Z) instead of just two
- Pleochroism And Color Change In Faceted Alexandrite: Influence Of Cut . . .
The color appearance of faceted gemstones is a complex subject, and the challenges are increased if the material is biaxial and pleochroism is added to the considerations
|
|
|