Browse > Article

A study on the identification of ruby and garnet by optical method  

Hwang Ji-Ho (Department of Gemological Engineering Dongshin University)
Choi Jong-Koen (Department of Gemological Engineering Dongshin University)
Abstract
The FT-IR absorption spectrum by the lattice vibrations of ruby and garnet obtained from FT-IR shows quite different characteristics. By the UV-VIS spectroscopy it was found that the ruby has two transmission bands in red and blue region, while garnet has only one transmission band in red region. The color filter to distinguish ruby from garnet was developed and named HWANG JI HO filter. Through the HWANG JI HO filter, ruby was shown in blue color and garnet was shown in dark red color because of the only the blue region transmittance of the filter. Other red stones, such as spinel, tourmaline were shown in dark red color like as garnet. The ruby could be recognized easily from the red stone.
Keywords
HWANG JI HO filter; Color; UV-VIS;
Citations & Related Records
연도 인용수 순위
  • Reference
1 F. Martin, H. Merigoux and P. Zecchini, 'Reflectance infrared spectroscopy in gemology', Gems and Gemology 25(4) (1989) 226   DOI
2 H. Kitawaki, 'UV-VIS spectrophotometric identification of rubies', Journal of the Gemological Society of Japan 21(1-4) (1996) 20
3 E. Fritsch and C.M. Stocktone, 'Infrared spectroscopy in gem identification', Gems and Gemology 25(1) (1987) 18
4 R.T. Liddicoat, 'Hand book of gem identification' Gemological Institure of America Calif (1993) 132