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2. Synthetic alexandrite - Wikipedia

   en.wikipedia.org/wiki/Synthetic_alexandrite

   Flux-grown alexandrite stones are expensive to make and are grown in platinum crucibles. Crystals of platinum may still be evident in the cut stones. Alexandrite grown by the flux-melt process will contain particles of flux, resembling liquid “feathers” with a refractive index and specific gravity that echo that of natural alexandrite. Some ...

3. Chrysoberyl - Wikipedia

   en.wikipedia.org/wiki/Chrysoberyl

   Czochralski or pulled alexandrite is easier to identify because it is very clean and contains curved striations visible under magnification. Although the color change in pulled stones can be from blue to red, the color change does not truly resemble that of natural alexandrite from any deposit. Hydrothermal lab-grown alexandrite has identical ...

4. Zultanite - Wikipedia

   en.wikipedia.org/wiki/Zultanite

   Zultanite rough crystal and gemstones. Zultanite is a gem variety of the mineral diaspore, mined in the İlbir Mountains of southwest Turkey at an elevation of over 4,000 feet. [1]

5. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   Certain synthetic color-change sapphires have a similar color change to the natural gemstone alexandrite and they are sometimes marketed as "alexandrium" or "synthetic alexandrite". However, the latter term is a misnomer: synthetic color-change sapphires are, technically, not synthetic alexandrites but rather alexandrite simulants .

6. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Swiss Gemmological Institute (SSEF), founded by Henry Hänni, focusing on colored gemstones and the identification of natural pearls; Gübelin Gem Lab, the traditional Swiss lab founded by Eduard Gübelin; Each laboratory has its own methodology to evaluate gemstones. A stone can be called "pink" by one lab while another lab calls it ...

7. Dzi bead - Wikipedia

   en.wikipedia.org/wiki/Dzi_bead

   Sometimes the natural patterns (usually "layered" swirls) of the agate can be seen underneath or behind the decorative symbols and designs. Cinnabar dots as seen on an ancient dzi. Some dzi beads exhibit what are referred to as "blood spots", which are tiny red dots in the white areas, indicative of iron content. This is a highly desirable ...