When a mineral body has another mineral/material trapped inside it, the inner material is called is an inclusion. In the world of gemstone, you would commonly see such irregularities. And they naturally happen during the developing stages of a gemstone. For instance, you may find crystals, liquid or gas bubbles, and natural fractures in the host gemstone.
The best part of these inclusions is that they help the gemologists identify the species of gemstones. There are specialized microscopic tools (dark-field illumination) to view and determine those inclusions. Knowing the precise use of microscopic tools and numerous lighting methods are of utmost importance else there is always risk of quickly making a conclusion. A crystal clear gemstone is the rarest of the rare. One should be grateful to the presence of inclusions as they help you identify a genuine stone or a synthetic.
There’s a common perception among buyers that a stone with inclusion is not a good choice. However, there are people who are absolutely fine with inclusions that actually enhance the appearance of a stone, therefore, making them even more precious. You can easily find crystals in the host gemstone owing their angular shape. Always keep in mind that if you see a crystal inside a gem, it means the gem is quite natural as the inclusion is a natural process.
Inclusions come in a variety of forms; solid, liquid, gassy,
Solid: If a gemstone has a solid object trapped inside it, it is a Solid inclusion. This inclusion has a proper shape and physical visibility to the eye. When the presence of such a solid mineral is discovered in the host mineral, it is nothing but a solid inclusion.
Liquid: There are cases when the host gemstone has a lot of cavities. Those cavities can be seen full of liquids such as water, carbon monoxide, saline, etc. For instance, an Opal may have liquid silica gel or hydrated silicon dioxide as much as 25% to 30%. The presence of such liquid inclusions creates rainbow colours in the host mineral.
Gassy: When the cavities inside the host gemstone brim with a gas, it is called as Gassy or Gaseous inclusions. Generally, the presence of a gas creates bubbles. The commonest instance is carbon monoxide gas. There are stones wherein gas and liquid inclusions are both present.
Other inclusions are classified as Type 1, Type 2 and Type 3.
Type 1: When you fail to see with your naked eye an inclusion in the hose gemstone, it is categorized as Type 1 Inclusion.
Type 2: When not all the inclusions are visible to the naked eye, it is termed is Type 2 Inclusion.
Type 3: When a host mineral is full of inclusions that have absolute visibility, such inclusions fall under Type 3 Inclusion.
With the helps of these inclusions in the gemstone, you can find out how a gem grew up or formed. You can find out its authenticity whether the host stone is natural or synthetic. It is interesting to see that some stones possess special inclusions that are not found in their counterparts while some inclusions only are found in one species of the gemstone or even in a single mine.
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