[1] [1] Gubelin E J. Gems & Gemology, 1982, 18(3): 123.

[2] [2] Kazmi A H, Lawrence R D, Anwar J, et al. Economic Geology, 1986, 81: 2022.

[3] [3] Bowersox W Gary, Anwar Jawaid. Gems & Gemology, 1989, 25: 16.

[4] [4] Giuliani Gaston, Groat A Lee, Marshall Dan, et al. Minerals, 2019, 9(2): 105.

[5] [5] Guo H S, Yu X Y, Zheng Y Y, et al. Gems & Gemology, 2020, 56(3): 336.

[6] [6] Zong K Q, Klemd R, Yuan Y, et al. Precambrian Research, 2017, 290: 32.

[7] [7] Saeseaw S, Pardieu V, Sangsawong S. Gems & Gemology, 2014, 50(2): 114.

[8] [8] Pardieu V, Sangsawong S, Cornuz L, et al. The Journal of Gemmology, 2020, 37(4): 416.

[9] [9] Hu Y, Lu R. Gems ＆ Gemology, 2019, 55(3): 338.

[10] [10] Cui Di, Liao Zongting, Qi Lijian, et al. The Journal of Gemmology, 2020, 37(4): 374.

[11] [11] Zwaan J C, Seifert A V, Vrana S, et al. Gem ＆ Gemology, 2005, 41(2): 116.

[12] [12] Bosshart G. The Journal of Gemmology, 1991, 22(7): 409.

[13] [13] Erkoyun H, Kadir S. Earth Sciences Research Journal, 2016, 20(3): A1.

[16] [16] Mashkovtsev R I, Thomas V G, Fursenko D A, et al. American Mineralogist, 2016, 101(1): 175.

[17] [17] Groat L A, Giuliani G, Marshall D D, et al. Ore Geology Reviews, 2008, 34: 87.

[18] [18] Wood D L, Nassau K. The American Mineralogist, 1968, 53: 777.