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Can alexandrite crack?
Alexandrite is a very strong gemstone, with a hardness rating of 8.5, but it can experience cracks or internal fissures from extreme pressure.
Can alexandrite be heated?
Alexandrite cannot be improved by any kind of thermal treatment. Although some have tried, heat treatment does not seem to affect alexandrite at all. Some lower quality cracked alexandrites are oiled to hide the cracks but beyond that, alexandrite is not known to be treated in any way. You can also ask is alexandrite good for daily wear? Alexandrite is relatively hard-8.5 on the Mohs scale. It has excellent toughness and no cleavage, which is a tendency to break when struck. This makes it a good choice for rings and other mountings subject to daily wear.
You can also ask why is alexandrite so rare?
Alexandrite is very rare because of its chemical composition. While it is a form of chrysoberyl, it has an extra trace element in addition to iron and titanium. It is the presence of chromium that gives it the emerald-green hue in daylight. Subsequently, what gemstone cannot break? Any gemstone can break when dropped onto a hard surface like a tile floor, including a diamond. Some manmade stones, such as the Cubic Zirconia with a Mohs hardness of 8 or 8.5 or Moissanite with a Mohs hardness of 9.25, will resist scratches and chips better than most other gemstones.
Regarding this, what is the second strongest gemstone?
Moissanite: The Second Hardest Mineral in Nature after Diamond. Correspondingly, what is the weakest gem? The Mohs Scale of Hardness 10 Diamond 4 Fluorite [Example: A knife will scratch it] 3 Calcite [Example: A copper coin will scratch it] 2 Gypsum 1 Talc [Example: A fingernail will scratch it] 5 more rows
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