Pls educate me on lab grown stones

[Bonsai]

I have some questions I have been trying to research adn cant find good answers on.

Do lab grown stones have inclusions?
If so the same inclusion as earth mined or a different type of inclusion that might indicate lab grown?
Is there a way I might tell or someone experience might tell if something is lab grown?

I know color can be a telltale sign.

I bought some earrings used and the colored stones are listed as “natural inclusions”. The emeralds for example are listed as “minor oil”. Are lab emeralds treated with oil?
Thx, just curious

 

[JackTrick]

Yes, they have inclusions. Sometimes similar to natural, often different.

An experienced person could likely use inclusions to help distinguish natural and lab grown stones (along with using other tools at their disposal).

Lab emeralds tend not to be treated with oil, because they tend to be cleaner than natural emeralds and don’t need the clarity enhancement.

 

[Bron357]

Lab created gems like corundum and spinel come in a range of colours and hues and depending on colour might be “mimicking“ a natural gemstone.
For eg “green” looking gems aka emeralds might not be lab grown beryl but rather lab grown corundum.
Lab created gemstones tend to be “perfect” to the eye however there is a way of causing “fractures” within the lab gem that resemble a natural fingerprint. I’ve seen a lot of “created emeralds” that have natural looking fissures within the stone.
A whole seperate issue is using natural, from the earth gem material but with the wonders of science turning a rubbish looking crystal into an attractive looking gem by heating, by filling with glass or flux or high heat with beryllium to enhance colour.
Emeralds are normally “oiled”. This is because the crystal structure of emeralds is normally full of imperfections. It just how emeralds form. To reduce the visual appearance of these crystal flaws, oil is introduced (by vacuum and mild heat) into the fissures to make them “disappear”. It’s an acceptable treatment but the oil over time can dissipate and the imperfections become more noticable. These days another treatment called Opticon might be used to the same effect however it is a permanent treatment and not as well accepted as “minor oil”.
it’s the lab report that tells you what has been done, if anything or everything, to the gemstone.
Because of the price differential between natural and untreated to natural and highly treated to grown in a lab it’s prudent to have a reputable lab certificate to be sure you’re getting what you’re paying for.
Because there is a lot of money to be made by selling “improved from rubbish” gems modern techniques are many and varied and often require specialised equipment to detect.

 

[T L]

Yes, they have inclusions. Sometimes similar to natural, often different.

An experienced person could likely use inclusions to help distinguish natural and lab grown stones (along with using other tools at their disposal).

Lab emeralds tend not to be treated with oil, because they tend to be cleaner than natural emeralds and don’t need the clarity enhancement.

Beware of synthetic emeralds with natural looking jardin in order to deceive. It’s amazing how natural some synthetics look!! Gone are the days of super clean and “too perfect” lab gems.

 

[JackTrick]

Beware of synthetic emeralds with natural looking jardin in order to deceive. It’s amazing how natural some synthetics look!! Gone are the days of super clean and “too perfect” lab gems.

A good point! My use of “tend to” needed some asterisks on it