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.