bicolor A stone with two distinct, separate hues, common in tourmaline.
bleed color The loss of saturation and tone when the viewing environment is shifted between natural and incandescent lighting.
Bicolor yellow and purple quartz gemstones are called Ametrine. Ametrine can also be cut to blend the two colors so that the resulting stone is a mix of yellow, purple, and peach tones throughout the stone.
Bicolor beryl on matrix. Half morganite, half aquamarine, with a bubble in the glassy top, seen on the left of the crystal. (Photo: Jason Stephenson) ...
* Bicolor- these are unique; no other gemstone resembles them except the lovely Ametrine, which is a mix of purple amethyst and yellow citrine.
For bicolored gemstones that have distinct color transitions such as tourmaline or ametrine it may be beneficial to utilize an elongated fancy cut such as an emerald, baguette, navette, or fantasy cut.
Concave Faceting ...
Ametrine is a bicolor variety of Quartz containing both Amethyst and Citrine colors. The stone is usually cut in facets in a rectangular shape to show both the yellow and purple colors. The Anahi Mine in Bolivia is the major source for Ametrine.
Summer 1970, A bicolored marquise diamond (outside rim, yellow-green; center area, medium red), p. 182, 2pp.
Fall 1970, Ultra-violet light in D to G color diamonds, p. 226, 1p.
Winter 1970, The facts about diamond imitations, p.
This highly unusual bicolored form of quartz-half citrine, half amethyst-is treated in detail by the Caltech Mineral Spectroscopy group.
Amphibole Minerals
A photo gallery of amphibole minerals.
Such bicolored stones are fairly unusual and can be very striking in appearance, but prices remain rather low.
Bicolor and tricolor tourmalines, with bands of colors are very popular. Sometimes the colors are at different ends of the crystal and sometimes there is one color in the heart of the crystal and another around the outside.
Bicolored crystals common; fine pinks.
Mined extensively from 1900-1912; pinks and reds favored by Chinese for carvings and other ornamental uses. Market all but evaporated with the collapse of the Manchu dynasty in 1912.
The variations in color along a crystal's length give rise to the bicolor and tricolor tourmalines which have multitudes of color combinations.
Lab-Grown Citrine/Green Quartz
This green and yellow bicolor quartz has a distinctive coloration, slightly similar to some tourmaline.
Lab-Grown Clear Quartz
This stone has clear, transparent qualities much like true rock crystal quartz.
Some greens, strong pinks and reds as well as the bicolored and tricolored stones with and without shiller are much more valuable.
Sometimes amethyst and citrine colors are found in the same crystal of quartz. These bicolor yellow and purple quartz gemstones are called ametrine.
Chanthaburi
Consult list of gems available on the Chanthaburi market...
Stones made up of two colors are known as bicolor and made up of three colors are known as tricolor whereas sometimes these are available in more than three colors also.
Also popular are the bicolor and tricolor tourmalines, which have varying patterns - sometimes the different colors are at the ends of the crystal, or the color at the center of the crystal can be different from the outside.
The opening of the mine also increased the supply of peach, salmon red-orange, red-green, green, blue-green, and bicolored and tricolored in combinations of yellow, red, and green.
Cranberry red, hot magenta, bubblegum pink, peach and orange, canary yellow, mint, grass and forest green, ocean blue, violet, and even bicolor pink and green stones: tourmaline is all these and more.
They are also found in all shades of red, from pink to deep red, and blue-green to light blue to deep blue, and as colorless crystals. The State's mines also produce bicolors and watermelon crystals.
a specially colored variety of zoisite and has thus far been found only in Tanzania. The stone's appeal derives from its usually immaculate transparency and intensive blue color, which can sometimes verge towards violet. Some tanzanites are bicolor ...
And if range of colors among different tourmalines is not enough, individual crystals can vary in color along their length or in cross-section.
The variations in color along a crystal's length give rise to the bicolor and tricolor tourmalines which ...
 See also: Color, Crystal, Stone, Gemstone, Jewel
  
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