Found inside – Page 99 Colors: white to colorless, occasionally reddish, bluish, yellowish, greenish, ... term for synthetic alexandrite-like sapphire, which changes color. Found inside – Page 179Neither synthetic color-change spinel nor synthetic color-change corundum, two gems often misrepresented as alexandrite, will exhibit this pattern or show ... Found inside – Page 68... 17.08ecarat, mixed cushionecut alexandrite shows the CIaSSlC color change of the gem. ALEXANDRITE IN NATURAL LIGHT I A BeA|204 ALEXANDRITE A gemstone ... Found inside – Page 50Alexandrite is one , the other is the cat's - eye , sometimes known as cymophane . The less common chrysoberyls ... this light contains more blue than red , and the alexandrite will not show its spectacular color change . The scientific reason for ... Found inside – Page 59The color change is due to chromic Oval brilliant - cut oxide , which in alexandrite partially replaces the alexandrite aluminum oxide that occurs in the ... Found inside – Page 1Keywords : Algorithm , alexandrite effect , color , color change , temperature , spectropyrometer , measurement , blackbody , plasma , discharge 1. INTRODUCTION The alexandrite effect refers to the color change phenomenon in crystals ... Found inside – Page 258Alexandrite Fake Alexandrite is the only stone you are liable to find, it is a form of synthetic corundum, violet with very little change in color. Found inside – Page 74system Inorganic class Oxide grouP Chrysoberyl sPecies Chrysoberyl gem varieties color-changing Chrysoberyl (alexandrite); single-color Chrysoberyl (yellow, ... Found inside – Page 24All other colors are termed sapphires and the exact dividing line between ruby and ... sapphire shows a similar color change to Cr-caused alexandrite (Sect. Found inside – Page 80The synthetics are more bluish in daylight and lack the rich hues and dramatic color changes which make a fine alexandrite one of the most appealing of ... Found insideAlexandrite, in its own color change, embodies an inner pattern of flexibility, adaptability and willingness to shift its expression in the presence of ... Found inside – Page 148A Word about Color Distribution or Zoning Even though zoning doesn't really describe color , it is very important in ... The gem alexandrite , on the other hand , always exhibits a color change , and its value is based largely on the degree of ... Found insideThe most sensational feature about this stone is its surprising ability to change its color. Green or bluish-green in daylight, alexandrite turns a soft ... Found inside – Page 973Alexandrite has the interesting property of changing colors depending Alexandrite is a bluish color in sunlight and changes to red in incandescent light. on ... Found inside – Page 113The gem alexandrite, on the other hand, always exhibits a color change, and its value is based largely on the degree of change. There are even color-change ... A comprehensive and visual gemology resource featuring more than 100 prominent gemstones. Found inside – Page 169Chrysoberyl ( Alexandrite ) Colors : Yellow , yellow - green , green ... Alexandrite , a rare green variety that can exhibit color change to red when held ... Found insideThe magic of gem-quality Alexandrite is in its property of color change—it is light red or red-purple in incandescent artificial light and green or ... Found inside – Page 7Just the facts In gemology , any Chrysoberyl that changes color can be called Alexandrite . The nomenclature is not dependent on the colors of the change . However , Alexandrite's color change is dependent on pure light sources ( pure ... Found inside – Page 70The daylight green changes to purplish - red in artificial light . Taken from mine on Takowaja River in Urals . A classic example , of great rarity today . Two Russian alexandrite gems showing reddish - brown color in. exact localities have never ... Found inside – Page 30color-change garnets, and even color-change tourmalines! In these gem families, however, the color change phenomenon is rare. The gem alexandrite, on the ... Found inside – Page 168Alexandrite does have natural color changing properties to it, but how does that explain her being able to use this stone to tell when others were lying to ... Found inside – Page 117Alexandrite Discovered in Russia in 1830 and named for Czar Alexander II , this gemstone of the chrysoberyl family changes color according to the light ... In this book the authors present an historical overview of emerald mining in the Urals, the discovery of Russian alexandrites in the Uralian emerald mines, the naming and historical use of alexandrites and their appearance and display in ... Found inside – Page 17The changing mysterious Colors, the noble history and the rareness of the expensive alexandrite make it perfect for a wedding event. Found inside – Page 71This colour-change is thought by some to be caused by metamerism, but because it is seen most dramatically in the rare alexandrite variety of chrysoberyl it ... Finally the real truth about how master jewellers, gemmologists and major auction houses value diamonds and colored gemstones. Found inside – Page 92... “Alexandrite” Flame fusion This synthetic color-change corundum is commonly mistaken for alexandrite; strong short-wave red fluorescence; color change: ... Found inside – Page 226About 80 % of the stone exhibited a very distinct color change , while the remaining 20 % was nonphenomenal bluish green . ... confirmed the identity of the color - changing portion as alexandrite and of the nonphenomenal area as emerald . Found inside – Page 11ALEXANDRITE keywords Joy and wisdom, release of sorrow chakras Heart (4th) ... The magic of gem-quality Alexandrite is in its property of color change—it is ... Found inside – Page 184Because of the change of color with different light , the Chinese name for Alexandrite is " Pienshih ” ( t ) meaning “ A Changable Stone ” . Since both the Boo and A1 , 0 , are colorless or white , the colors of this mineral must be due to some ... Found inside – Page 181Color change resulting from different types of illuminating light is called the alexandrite effect, named after the mineral that shows this effect, ... Found inside – Page 28... color change, can also show chatoyancy Variety/Trade ames: Cat's eye alexandrite (very rare variety displaying both a chatoyant band, and a color change ... Found inside – Page 87Estimate: $3,000 – $4,000 381.75 GEM ALEXANDRITE WITH EXCELLENT COLOR CHANGE Takowaya River, Urals, Russia From the classic and most desirable of ... Found inside – Page 16Although famous for changing color from green in sunlight to red in incandescent light, few alexandrites actually make a full-fledged color change. Found inside – Page 13... Red spinel Blue alexandrite Color - change sapphire Blue moonstone Artificially blue - tinted chalcedony Bohemian chrysolite Moldavite ( natural glass ) ... The color changing property of alexandrite is not unique to the stone. Scientists call it The Alexandrite Effect. Found inside – Page 390ALEXANDRITE , A GEM WITH EXCITING COLOR CHANGE Not discovered until 1891 , alexandrite is a comparatively new stone and has been added to the list of June birthstones . It is a form of chrysoberyl in which the finest specimens ... Found inside – Page 40natural light, the outstanding example of color-change in gem- stones • Gem-quality alexandrite among the most expensive of all gem- stones • Because of its ... Found inside – Page 15The magic of Alexandrite is in its property of color change—it is light red ... (Appropriate to its name, the red and green colors of Alexandrite were the ... Found inside – Page 144Alexandrite cat's eyes are known but are very single beam of light a cabochon is cut so the tubular inclusions are parallel ... The synthetic corundum has little resemblance to alexandrite since its color change is from grayish - blue in daylight to ... Found insideIf one loves magic, especially the magic of science, this person will love Alexandrite, the color-change gem. Outside, in daylight, it is a cool bluish ... Found insideIts property of changing color in different lights symbolizes the ideal of ... Alexandrites shift their colors when different wavelengths of light shine ... Found inside – Page 160The most dramatic feature of alexandrite is the color change. This effect is caused by combination of factors. The presence of the chromium in combination ... Found inside – Page 94Alexandrite is an orthorhombic crystal and therefore is biaxial ( i.e. , it has two optic axes ) and therefore displays trichroism . ... spectrum is very similar to that of alexandrite but with a less spectacular grayish green to purple color change . Found inside – Page 81Color change Alexandrite exhibits color changeifrom brilliant green in daylight to cherryered under tungsten light Ferrocolumbite PROFILE This opaque, ... Found inside – Page 85Changing colors The alexandrite variety of chrysoberyl displays a color change, from greenish to reddish, when seen in different light conditions. Found inside – Page 73Alexandrite Alexandrite is the color-change variety of chrysoberyl. The most distinctive specimens appear to have a green to blue-green color in daylight ... Found inside – Page 83Alexandrite has been called “an emerald by day, an amethyst by night. ... lack the rich hues and dramatic color changes which make a fine alexandrite one of ... 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