What Are the Causes of Color in a Yellow Sapphire?
While most people envision sapphires as bright blue gemstones, sapphires can actually come in many different colors. Yellow sapphires are highly prized for their vibrancy and for a bright yellow hue that rarely occurs in nature....
Purple sapphires contain trace amounts of vanadium and come ... If trace
amounts of iron are present, a very pale yellow to green color may be seen. ...
which causes color for chromium and vanadium ...
In general, increased iron concentrations will increase color saturation. The trace
element titanium causes an undesirable green cast in yellow sapphires, and ...
www.gia.edu/cs/Satellite?blobcol=gfile&blobheader=application/pdf&blobheadername1=Content-Disposition&blobheadername2=MDT-Type&blobheadername3=Content-Type&blobheadervalue1=attachment; filename=The-Seven-Types-of-Yellow-Sapphire-and-Their-Stability-to-Light&blobheadervalue2=abinary; charset=UTF-8&blobheadervalue3=application/unknown&blobkey=id&blobtable=GIA_DocumentFile&blobwhere=1355958458175&ssbinary=true
ally seven types of "yellow" sapphire on the market today, which differ in the
cause of color and the stability of the color to light: type I -natural, light-stable.
The authors determined that there are actually seven types of "yellow" sapphire
on the market today, which differ in the cause of color and the stability of the ...
Sapphires are described by their colors (blue, green, and yellow), with the most
sought-after color being cornflower blue. The color is very stable, even when ...
The color of yellow sapphire stone varies from greenish, orangish to canary
yellow. ... It causes rutile silk inclusions that are present in the structure of
Diffusion: colourless to yellow-orangy rim, blue haloes/spots (internal diffusion).
.... Causes of Colour, The coloring agents in blue sapphire are iron and titanium ...
Color. Sapphire occurs in many colors ranging from colorless to black. When a
corundum variety is termed "sapphire" it indicates the blue ...
Nov 29, 2013 ... Color Change Sapphire Gem Information, learn about color change sapphire ... a
range of other colors, including greenish, yellowish, pinkish and violet-purple, ....
bleach or hydrofluoric acid, as chemicals can cause corrosion.