Abstract
Jet is a special case of fossilized wood found in the northwest of Phu Quoc Island. By applying standard gemological methods and advanced analysis, including EDS, Raman, and FTIR spectroscopy, this paper aims to determine the identifying characteristics and gem quality of the jet from Phu Quoc Island for jewelry manufacturing. Jets from Phu Quoc display a gorgeous black color, opaque appearance, black streak, greasy to subvitreous luster, and a glossy fracture. The measured gemological indices include specific gravity - 1.24; refractive index - 1.66; inert under UV light; and isotropic. The deformed wood grain texture is visible under a microscope (400x and 100x). Chemical compositions are mainly carbon, oxygen, hydrogen, and nitrogen using EDS and Raman Spectroscopy. FTIR diagrams indicate that jet samples originated from the deformation of organic material, such as an ancient tree, with distinctive peaks at 2900 cm-1 (C-H), 1640 cm-1 (C-C), and 1200 cm-1 (C-O). The results show that the Phu Quoc jet is classified as a saltwater jet or hard jet. Hence, the jet from Phu Quoc is of good quality to be made into valuable ornaments and pieces of jewelry.
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