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Library > Gemology > GemBiz
 
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[808] Beryllium-Diffused Blue Sapphire?
Beryllium diffusion typically brightens the color of ruby or sapphire, making a stone more yellow, orange, or red, depending on the original color. Because the color change can go all the way through the stone, the treatment is more difficult to identify than traditional diffusion, which is an easily-detected surface treatment. When beryllium diffusion was first introduced to the market in 2001, uncertainty about disclosure created a controversy that led to a sharp drop in prices for the diffused stones. Today, beryllium-diffused corundum sells for a fraction of the price of its natural or heated counterparts.... (2006)
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Show me more articles from: [Colored Stone]|[Beard Morgan]
Releated Categories: [GemBiz]
ISBN: B000060MIL

 

[794] Blue Spinel Turns Heads With New Top-grade Material
Well worth a fresh inspection under the loupe is some fine blue spinel currently on the market. An ancient group of related minerals, spinel likely owes its name to the Old Latin sintill -- from which the word scintillation was derived. And a good descriptive name it is. If you havent considered blue spinel for a fine jewelry piece, remember that its density assures a high polish when faceted. Rating an 8 on the Mohs scale, this gem doesnt need to be coddled in protective mountings, either.... (2006)
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Show me more articles from: [Colored Stone]|[Diana Jarrett]
Releated Categories: [GemBiz]
ISBN: B000060MIL

 

[325] Chalcedony - A Gem for the Ages
The gemstone industry tends, for marketing reasons, to limit the definition of chalcedony somewhat more than mieralolgists. Among gemstone and jewelry sellers, the term chalcedony is usually used to refer specifically to semitransparent to translucent white, blue, pale grayish-blue, purple, pink, yellow, orange, red, or solid-colored materials other than carnelian, sard, or chrysoprase.... (2003)
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Show me more articles from: [Colored Stone]|[Gordon Austin]
Releated Categories: [GemBiz]
ISBN: B000060MIL

 

[900] Chris Smith - Amazing Adventures with Tanzanite
A year ago, there wasnt much new to be said about tanzanite, the oven-blued zoisite found only in its namesake country of Tanzania. Known to be benignly heated from brown to blue since its discovery in the mid-1960s, tanzanite was one of the gem worlds safer, most worry-free precious stones. Then, last summer, this gem suffered its first major gemological scandal.... (2009)
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Show me more articles from: [Colored Stone]|[Morgan Beard]
Releated Categories: [GemBiz]
ISBN: B000060MIL

 

[766] Colored Stone Annual Retail Survey 2005
A decade ago, emerald, ruby, and sapphire routinely topped Colored Stones annual best seller list, as befitted the colored stones known in the trade as the "Big Three." They were "precious" stones, while their equally colorful but lesser-known cousins held the dubious distinction of being "semiprecious." But the Big Threes once-unassailable dominance has faded in recent years. In 1999, tanzanite cracked the top three, pushing emerald to fourth place. Pearl followed suit in 2001, when it appeared in the number two slot, as did fancy sapphire in 2004... (2006)
Complete Story

Show me more articles from: [Colored Stone]|[Suzanne Wade]
Releated Categories: [GemBiz]
ISBN: B000060MIL

 

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