MAGI Application Note:

Nov. 22. 2012 Mikko Åström & Alberto Scarani

Determining color origin of red coral & conch pearl

Pink to red coral can be readily identified by microscopic examination of the characteristic grooves or channels that the coral polyps used to transport nutrients. However, after positive identification two important questions still remain. Is it natural color or has the material been bleached & dyed? Is it legal species (not a member of Stylasteridae family which is protected by CITES) ? GemmoRaman-532 is cabable for answering both of these important questions.


Smith C.P., McClure S., Eaton-Magaña S., Kondo D. (2007) Pink- to-red coral: A guide to determining origin of color. Gems&Gemology Spring 2007, Vol. 43, No. 1, pp. 4–15.

Stefanos Karampelas, Emmanuel Fritsch, Benjamin Rondeau, Aude Andouche, and Bernard Métivier: Identification of the endangered pink-to-red Stylaster corals by Raman spectroscopy. Gems&Gemology Spring 2009, Vol. 45, No. 1, pp 48-52