Trichroism
With trichroism, three colors are perceived when observing the stone from two different directions. Minerals in the monoclinic, orthorhombic, and triclinic crystal system are trichroic, and can show three colors.
Trichroism: Those gems that display precisely three different colors when viewed from different angles.
Trichroism
The transmission of three different colors in three different optical planes as light passes through a gemstone material. May be used to distinguish one gemstone material from others.
Trichroism A property of a stone that will show three colors or shades of the same color when the stone is viewed through a dichroscope.
Trillion Cut A faceted cut in a triangular shape with 44 facets.
TRICHROISM: The property of most doubly refractive, colored gemstones belonging to the orthorhombic, monoclinic, and triclinic crystal systems, ...
Trichroism
Gems that display three different colors when viewed from different angles.
Tanzanite has 3 different colors in it - this is called trichroism and Tanzanite is one of the very few gemstones on earth that has this.
It closely mimics the color of natural tanzanite however it does not display the same trichroism. Tanzanite is the mineral zoisite, while tanzanique is forsterite. Several different hues of CZ have also come into use as tanzanite simulants.
Andalusite has very strong trichroism; if you examine the green stones carefully, you can see green running in one direction and a reddish brown color in the other direction. The third color, yellow, is difficult to see with out a dicroscope.
While cutting the stone, the entire concentration of the cutter remains on the trichroism of the stone. It is cut into all traditional shapes like square, round, oval, marquise, rectangle, emerald and trillion cut etc.
In minerals with three principal vibration directions (three refractive indices), three different pleochroic colors can be detected, called trichroism (with only two observed in any one direction).
The cutter, then, must orient the rough carefully, taking iolite's trichroism of blue-violet, grey and near colorless into account in order to achieve an attractive "face up" color.
Suddenly you’ve created a shape where all three dimensions are different. These trimetric crystals have three refractive indices and the potential to display three different colors (trichroism).
 See also: Color, Gemstone, Stone, Gemstones, Crystal
  
|
RSS
