Feb 202015
 
Figure 1: Solid opal or opal doublet (composite)

Solid opal or opal doublet (composite)

Admin: Alan Hodgkinson is a Special Guest Author for the AIJV.  Here, Alan explores a tricky opal doublet.

It would certainly make life easier for the gemmologist/ appraiser if all composite gems were claw set, or even better if loose (unmounted) – wishful thinking of course. In such situations, the doublet joint is so easy to see.

Life was never meant to be so straightforward and there are situations where the junction plane of a doublet is concealed by a collar setting (figure 1). The pendant shown (Figure 2) provides a good example of the problem.

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Dec 222010
 

Admin: Antoinette Matlins is a Guest Author for the AIJV.
Here, Antoinette warns of the dangers surrounding the new “composite ruby” and reflects on the trade’s responsibilities to educate.

Rubies remain one of the most popular of all the precious gems, and following the recent publicity surrounding Jessica Simpson’s ruby and diamond engagement ring, are likely to become even more so.

A few years ago this would have been good news to the jewelry trade, but today it may spell disaster for many retailers, designers, buyers and sellers of estate jewelry, and bench jewelers when serious and irreparable damage occurs to a “ruby” in the course of normal wear or, worse yet, when being mounted, re-mounted, re-sized, and so on. Shock sets in when a ruby becomes a molten glob on the workbench, or when its appearance is horribly marred by acid etching from top to bottom, around the entire stone. And some appraisers are making matters worse. Continue reading »