Treatments are applied to all Emerald Gemstone (Panna stone). This is a little-known fact, that all the dealers are afraid to disclose it.

They fear that it will reduce the price and value of the Emerald stone. All the Emerald gems have flaws in it. So treatment is done to remove these flaws in order to increase the price and value of the Emerald and also it increases the luster of the Emerald.

By this, we are generally referring to anything that increases the value of a gemstone with artificial color-quality treatments. The following are Emerald Stone Treatments.

  • Palm Resin.
  • Cedar Wood Oil.
  • Gematrat.
  • ExCel.

Treatments are applied to all Emerald Gemstones

Palm Resin

Palm Resign is also called Palma. It’s a type of oil-like treatment which is used in place of  Cedarwood oil. This kind of treatment is not permanent because it leaves a milky white scrap. It has not been considered an acceptable treatment, but still, it is used.

Cedar Wood Oil

Many years ago, Greeks started using colorless oils to improve the luster of Emerald taken from Egypt. The people used to fill cracks in the Emerald with oil in order to pass light through the gemstone.

In the modern era, colorless cedarwood oil is used for the last 4 decades. It is not permanent, but better to use. Most of the emeralds sold by Embassy Emeralds have been lightly treated with cedarwood oil.


Gematrat was a way to permanently treat Emeralds. This was applied to leave them in a stable finished. This procedure is called ‘gemstone branding’  which begins with a very soft cleaning of the stone.

This procedure may take weeks or even months in some cases. The colorless Gematrat is used to fill the cracks in the Emerald.


Another Emerald treatment after Gematrat process is ExCel. This process is quite different from Gematrat because of any kind of treatment and the appearance of many fakes that mimicked the tracer’s effect under ultraviolet light.


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2 Replies to “Emerald Gemstone Treatments”

  1. Dear Sirs,

    I am pleased to see your site, full of great information about emeralds, my favourite stone.

    May I ask you the difference between Gematrat and Excel ?

    I really want to understand this.

    Thanks a lot !

    1. these are two treatments of Emerald Gemstone

      Gematrat was developed in 1997 as a way to permanently treat emeralds, leaving them in a stable and permanent state once finished. The process has been defined as ‘gemstone branding’ and begins with a very extensive cleaning of the stone which may take weeks or even months in some cases. The stone’s tiny fissures and cracks are then filled with the colorless Gematrat substance, which is said not to leak or discolor. The substance also contains a tracer which glows blue under ultraviolet light. According to the producers of the treatment, you can put Gematrat treated gems in an ultrasonic cleaner, a steamer, and even recut the stone without damage. The stones are marketed with an American Gemological Laboratories (AGL) report.

      and ExCel is Another emerald treatment process developed after the Gematrat process. This process does not include the tracer element that was present in the previous process because of incompatibilities with the treatment and the appearance of many fakes that mimicked the tracer’s effect under ultraviolet light. Information about the gem is laser engraved on the girdle of the stone.

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