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Jewelry, Gems, & Minerals/What's a Black Star of India gemstone worth?

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Question
Hi,

How much is a 1 carat faceted Black Star of India gemstone worth?

Thank you.

Sincerely,
Kari

Answer
That depends if this is a real "Black Star of India" gem, which is the mineral corundum (Al2O3) or if this is a diopside mineral (CaMg(Si2O6)), marketed as an "imitation" black star of india. If you can see the "star" within the stone, you can tell. The inferior diopsides would have 4 armed stars with one star slightly off a 90 degree intercept. Corundum would show 6 armed stars. In rare cases a 12 armed star is observed.

Is your stone really black, or is there another subcolor, such as red, blue, or green?

Is the stone really faceted or is it polished (round or oval)? You can get round / oval, polished REAL black stars of India for about US$30-60/carat.

The polished black diopsides are much less, usually around US$1.00 per carat or less!

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Uwe Richard Kackstaetter, Ph.D. (Dr.K)

Expertise

I can answer questions concerning minerals, mineralogy, gems, metals, and anything that has to do with geology. However, I am NOT a jeweler. Questions about values, settings, gem stone cuts and appraisals are best directed to other experts on this site. I can however aide in the identification of unknown mineral materials. As a public service and part as training for new geoscientists, our university department provides FREE mineral identification for individuals. Please contact me for details or go to http://college.earthscienceeducation.net/MIN/MINID.pdf for details..

Experience

I am a professor of applied geology and mineralogy with many hours of field experience. Furthermore, I enjoy recreational gold prospecting and mineral collecting. As a professor I am engaged in research concerning minerals and their occurrence.

Organizations
Member of the GPAA (Gold Prospectors Association of America) as well as the Association of Environmental Geochemists. Member of the GSA (Geologic Society of America) Member of the AIPG (American Institute of Professional Geologists)

Publications
Here is a small sampling: Mineral-rock handbook: Rapid-easy mineral-rock determination : written for anyone interested in minerals and rocks - Proctor, Peterson, and Kackstaetter;Macmillan Pub. Co. (New York and Toronto and New York) Physical Geology Laboratory e-Manual [CD-ROM], Kackstaetter, Earth Science Education LLC Colorado Front Range Self-guided Geology Field Trips, Kackstaetter, http://www.scribd.com/doc/27175290/Colorado-Front-Range-Self-Guided-Geology-Field-Trips

Education/Credentials
Ph.D. in Applied Geology and Mineralogy. I am actively teaching courses in mineralogy and a variety of field courses with mineral collecting opportunities. Background in precious metal exploration.

Past/Present Clients
Numerous!

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