What is an optical phenomenon? Plainly put, this term embodies the result of the way light interacts with the crystalline structure, inclusions, and/or internal structure of a gemstone. It is, in essence, the reflection, diffraction, absorption, and/or diffusion of that light. Without even knowing, we encounter these phenomena on a daily basis, whether in opal, moonstone, alexandrite, or cat’s eye chrysoberyl—that said, one should be careful not to confuse optical property, such as dispersion in a diamond, with optical phenomena.
Field gemmology and travelling to mines directly is a great learning opportunity: you can see the sites and the people you want to work with, observe the conditions, build relationships and contacts, and meet amazing individuals with infinite stories they can share with you over a good drink.
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