Discover P.J. Joseph's blog, your guide to colored gemstones, diamonds, watches, jewelry, art, design, luxury hotels, food, travel, and more. Based in South Asia, P.J. is a gemstone analyst, writer, and responsible foodie featured on Al Jazeera, BBC, CNN, and CNBC. Disclosure: All images are digitally created for educational and illustrative purposes. Portions of the blog were human-written and refined with AI to support educational goals.
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Monday, July 30, 2007
Common Opal
The reason why play-of-color is absent in common opal could be due to:
- variation in sphere size (s).
- non-spherical.
- the spheres may be of identical size (s) but disordered.
- the spheres may be too large or too small to cause diffraction.
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