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2. Cubic zirconia - Wikipedia

   en.wikipedia.org/wiki/Cubic_zirconia

   Cut: Cubic zirconia gemstones can be cut differently than diamonds: The facet edges can be rounded or "smooth". Color: only the rarest of diamonds are truly colorless, most having a tinge of yellow or brown to some extent. A cubic zirconia is often entirely colorless: equivalent to a perfect "D" on diamond's color grading scale. That said ...

3. Zircon - Wikipedia

   en.wikipedia.org/wiki/Zircon

   It occurs as a common accessory mineral in igneous rocks (as primary crystallization products), in metamorphic rocks and as detrital grains in sedimentary rocks. [2] Large zircon crystals are rare. Their average size in granite rocks is about 0.1–0.3 mm (0.0039–0.0118 in), but they can also grow to sizes of several cm, especially in mafic ...

4. Gemology - Wikipedia

   en.wikipedia.org/wiki/Gemology

   Any single test is nearly always only indicative. For example: The specific gravity of ruby is 4.00, glass is 3.15–4.20, and cubic zirconia is 5.6–5.9 . So one can easily tell the difference between cubic zirconia and the other two; however, there is overlap between ruby and glass. As with all naturally occurring materials, no two gems are ...

5. Zirconium dioxide - Wikipedia

   en.wikipedia.org/wiki/Zirconium_dioxide

   Like diamond, cubic zirconia has a cubic crystal structure and a high index of refraction. Visually discerning a good quality cubic zirconia gem from a diamond is difficult, and most jewellers will have a thermal conductivity tester to identify cubic zirconia by its low thermal conductivity (diamond is a very

6. Ceria-zirconia - Wikipedia

   en.wikipedia.org/wiki/Ceria-zirconia

   The crystal structure adopted by ceria-zirconia depends on the Zr/Ce ratio and temperature. At very low Zr concentrations, ceria-zirconia exhibits the cubic fluorite structure, which is common to both pure ceria and cubic zirconia (pure zirconia normally only adopts a cubic structure at high temperatures). However, at higher Zr contents, other ...

7. Trump says Bill Gates asked to meet in apparent message to Musk

   www.aol.com/trump-says-bill-gates-asked...

   In a message that appeared to be intended as a private communication to Elon Musk, President-elect Donald Trump said in a social media post Friday that Microsoft founder Bill Gates had asked to ...