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Gem Focus - October 2021

Posted on October 13, 2021 by Çiğdem Lüle, PhD, FGA, GIA GG, DGA

Prasiolite: The least understood variety of quartz. The idea of “common” might discourage gaining further knowledge about a gemstone. The quartz group gems, as common as they are, seem to be the least understood not only…


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Fitting A Jade Bangle

The bangle is the most popular jade jewel, but it is also the most complex to select. Next to all quality parameters, personal preferences, and budget, choosing the right size is of utmost importance. And when it comes to green and purple jadeite, perfect bangles are, as one would say, unheard of. Table 1 shows approximate retail values that currently apply for inferior to exceptional quality jade.


Cerussite is a mineral species, lead carbonate, with the formula PbCO3. It crystallizes in the orthorhombic system. It is an important ore of lead.

Basic Gem Testing

One-step testing is a tempting proposition; however, it requires extensive knowledge and experience to perform the minimum number of tests required for accurate and conclusive identification.