Category: Featured Articles

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.

Diamond Treatments and Pricing

Determining pricing for treated diamonds can be a great challenge. The focus here is on the history and pricing trends of modern-day diamond treatments. Four are in this group including laser drilling, clarity enhancement, high pressure high temperature (HPHT), and irradiation.

Behind the Design – Derek Katzenback

For our series on innovators in jewelry design, this month we are focusing on multiple AGTA award winning artist, gem cutter, metalsmith, and gemologist Derek Katzenbach owner of Katzenbach Designs. Located in Maine, it came as no surprise that Derek has a special passion for working natural Maine tour- maline.

Hunting for 100 Point Ratings

In light of the recent announcement that the Gübelin Gem Lab would introduce a rating system for gemstones, which is admittedly influenced by the process in use for wine, it seems appropriate to examine the potential implications for our industry, but from the context of the wine industry, where the pros and cons of such systems are known.