Listed are some data for individually tested Zircons

                           SG       RI
Green, Sri Lanka          3.96  1.792-1.796
Greenish brown, Sri Lanka 3.98   1.818 no DL
Green, Sri lanka          3.99   1.83  no DL
Orange "    "             4.00   1.823 no DL
Green, "    "             4.12  1.832-1.849
Green, "    "             4.24  1.87 -1.884
Green, "    "             4.30  1.87 -1.888
Green, "    "             4.31  1.92 -1.962
Yellowish green" "        4.43  1.9  -1.925
Brown  "         "        4.47  1.91 -1.938
Reddish brown, Sri "      4.62  1.925-1.976
Blue indochina            4.69  1.927-1.986
Colorless, Sri Lanka      4.69  1.926-1.985
Brown, Burma              4.69  1.926-1.984
Yellow, Indochina         4.70  1.926-1.985
Golden brown,Burma        4.71  1.933-1.99