Treatments or enhancements on the Blue sapphire gemstone (Neelam stone) are done to either make the color light or dark or to improve the clarity and transparency.
The natural blue sapphire stones are taken from the earth by the mining of these gems. Then the mined sapphire stones are not in good clarity and found in raw shape. Further, these sapphires stones are polished in laboratories.
This is obviously done so that the sapphire gemstone can fetch a better price in the market.
However, it is ethically important for a dealer, to disclose whether the sapphire is heated or unheated or whether a treatment has been done on the gemstones while trading.
Heating to a very high temperature for the purpose of changing its appearance.
Heating at a very temperature in presence of coloring agents for allowing chemicals to penetrate in the stone.
Stones are filled with epoxy resin or glass OR lead glass to conceal the fractures.
Imitation sapphires are other substances, such as synthetic spinel, blue CZ, or glass. These are also not considered as natural sapphire stones in the gemstone world.
Any treatment done on the stones damages its internal structure of the gemstones.
Hardness & Toughness
The hardness of 9 on the Mohs scale and Toughness are usually excellent but large fractures can lesser the durability.
Stability (Resistance to Heat and Chemicals)
Heat – Heat can cause a change in color or clarity.
Light – Fracture filling may dry out.
Chemicals – It can harm the fillings in fracture-filled stones.
Synthetic Blue Sapphire Gemstone
A synthetic gem is a man-made material with essentially the same chemical composition, crystal structure and optical and physical properties as the natural gem material.
Blue Sapphire stone synthetics are readily available in the market. Blue Sapphire is made from flame fusion, flux, hydrothermal, floating zone many processes in the market.
As we already know synthetic sapphires stones are , man-made gems that are created in a lab. Synthetic sapphire gems are the glass-filled gemstone that is made by filling residue of real and natural sapphire stone after polishing in the lab.
After filling this residue of sapphire in glass and heating on the high temperature the synthetic gemstone is created.