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With the exception of orthorhombic zoisite (tanzanite and thulite), discussed in the first article on the sorosilicate class of minerals, the members of the epidote group form in the monoclinic crystal system. Allanite, clinozoisite (the dimorph of zoisite), epidote, hancockite, mukhinite, and piedmontite are members of this group.... (1999) Complete Story
Vietnam produces rubies as good as anything from Burma. But the machinations and intrigue surrounding the gem business in that country have left this potential largely unexploited.... (2004) Complete Story
The primary issue with topaz that must be remembered at the bench is its one perfect cleavage direction. Hammering or putting pressure on a topaz runs the risk of cleaving the stone into pieces. Routine stone tightening on a prong set topaz can result in cleaving the stone. Setting a topaz in prongs presents a greater risk than tightening. To minimize the risk, avoid alloys that are very hard, as well as overly thick prongs. Cut stone seats with care and smooth away any burrs left by tools.... (2004) Complete Story
Zircons were called "jacinth" or "hyacinth" in older writings. Zircons are exceptionally brilliant gemstones; the high zircon has the highest refractive index of any natural transparent gemstone. High zircons are usually blue or colorless. Fine blue zircons are rare, but they are exceptionally beautiful stones.... (1999) Complete Story
If you are looking at a tanzanite it is critical to view it under different lighting conditions. In daylight tanzanite will display the most blue, incandescent light will bring out the violet color. Generally those stones that are brilliant blue with minimal violet, even in incandescent light, will command the highest price. If you prefer the violetish shades you will pay less.... (1999) Complete Story
