Black Friday deals are near. Best Buy has announced that its early Black Friday sale will kick off on November 8, and I expect other retailers like Walmart and Amazon to follow its lead.

Black onyx, plastic, or natural matrix have served as the bottom layers of opal doublet or triplet cabochons. Opal triplets are topped with a transparent dome made of rock crystal, plastic, glass, or ...

1. The most commonly encountered irradiated gems include: Diamond – Neutron and electron radiation are the most common forms of artificial irradiation, and it is possible to induce black, green, blue ...

Using corundum as the reference material also facilitates analysis and preparation of ... This example demonstrates the ability of fullpattern fitting to analyze samples containing amorphous or poorly ...

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