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Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls)

Nicholas Sturman, Artitaya Homkrajae, Areeya Manustrong, and Nanthaporn Somsa-ard, October 31, 2014

Examines the internal structure, chemical composition and spectroscopic features of 22 pen pearls.

Characterisation of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy

Ahmadjan Abduriyim, et al.

A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.

A Look Inside a Remarkably Large Beaded South Sea Cultured Pearl

Laura M. Otter, Ursula Wehrmeister, Frieder Enzmann, Martin Wolf, and Dorrit E. Jacob, April 30, 2014

A study of the nacre and the cavity of a large Pinctada maxima cultured pearl yields a theory on the specimen’s formation.

Hornbill Ivory

Robert E. Kane, June 1, 1981

The author reviews the nature of this material and some of the forms into which it has been fashioned, as well as means of identifying hornbill ivory from other ivories and from imitations.

A Comparison of Modern and Fossil Ivories Using Multiple Techniques

Zuowei Yin

This article provides identification criteria to distinguish between modern and fossil (mammoth) elephant ivory.

Identification of the Endangered Pink-To-Red Stylaster Corals by Raman Spectroscopy

Stefanos Karampelas, Emmanuel Fritsch, Benjamin Rondeau, Aude Andouche, and Bernard Métivier

All corals within the Stylasteridae family (including the Stylaster genus) are listed in Appendix II of CITES.

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