How can you tell a natural alexandrite?

Real alexandrite usually changes from something in the green color range in daylight or fluorescent light to something in the red range in incandescent light. If it changes from blue to purple it is almost always a synthetic sapphire. If it is large and very clean internally you can bet it is not real.

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Can we wear gemstone while sleeping?

Well, if the gemstone ring is worn on the basis of astrology, then you can't remove it at night. Since it is believed that while wearing any astrological gemstone ring, some rituals are performed and hence, while removing it also some rituals are performed. So, you just can't take off your gemstone ring like that. Subsequently, can we wear gemstone of debilitated planet? Thus, a stronger planet will always saves you, gives you strength. Even our dushthanas of kundli, gives us strength to fight evil of our life, if their lords are strong ( another classical principles). Thus, yes, you may wear gemstone of a debilitated planet.

What stone is similar to alexandrite?

Only sapphires and garnets can show any real resemblance to alexandrite. Color change sapphires are basically known to occur in two types; the ones that change from blue to purple and the ones that change from green to red. Accordingly, how does alexandrite change color? The chromium traces cause strong light absorption in the yellow and blue parts of the spectrum. The absorption band 580 nm allows the Alexandrite to change color from red to green when seen under different light. The image above shows what makes up the different types of lighting we commonly see.

What is aquamarine density?

7.5 - 8 on the Mohs scale. Refractive Index: 1.564 - 1.596. Density: 2.68 - 2.74.