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Refractive indices, faceting angles, polishing materials of gemstones 

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Gemstones RI Critical angle Crown/Pavillion main H polish with
Vargas M.D.R. Schlagel
andalusite

1.63-1.64 B-

 37.5 41/42 43/39 35/39

7 1/2

 aluminum oxide
apatite

1.63-1.64 U-

 37.5 41/42 43/39 35/39

5

 aluminum oxide
benitoit 1.76-1.80 39 - - - 6 1/2 cerium oxide
beryl

1.56-1.59 U

 39.27 42/43 42/43 37/41

7 - 7 1/2

 aluminum oxide
chrysoberyl

1.74-1.75 B

 35 40/42 37/42 37/42

8 1/2

 aluminum oxide
corundum

1.76-1.78 U

 34.62 40/42 37/42 36/40

9

 diamond powder
cubic zirconia 2.15-2.18 27 - 35/41 - 8 1/2 diamond powder
diamond

2.42

24.43

 - 35/41 -

10

 diamond powder
feldspar group

-

 41 42/44 42/43 39/43

.-

 -
          orthoclase

1.518-1.526 B-

 - - - -

6 - 6 1/2

 aluminum oxide
          microcline

1.522-1.530 B-

 - - - -

6 - 6 1/2

 aluminum oxide
        labradorite

1.559-1.568 B+

 - - - -

6 - 6 1/2

 aluminum oxide
           oligoclase

1.539-1.547

 - - - -

6 - 6 1/2

 aluminum oxide
florite   

1.43

 44.37 43/45 41/45 41/45

4

 aluminum oxide
garnet group

-

 - - - -

-

 -
         almandine 

1.76to1.81

 34.5 39/41 37/42 36/40

7 1/2

 aluminum oxide
           grossular

1.74-1.75

 35 40/41 37/42 36/40

7 1/4

 aluminum oxide
              pyrope

1.74to1.76

 35 40/41 37/42 35/39

7 1/4

 aluminum oxide
        spessertine

1.80-1.82

 33.5 39/42 37/42 36/40

7 1/4

 aluminum oxide
           andradite

1.89

 32 - 37/42 -

6 1/2

 aluminum oxide
iolite

1.54-1.56B-

 40 42/43 42/43 38/42

7 - 7 1/2

 aluminum oxide
jade group - - - - - - -
                 jadeit

1.65to1.67

 - - - -

7

 -
                nefrite

1.62

 - - - -

6 1/2

 -
moissanite

1.85

 22.17 - - -

4

 diamond powder
opal

1.45

 43.6 43/44 41/45 41/45

6

 cerium oxide
peridot

1.65to1.69

 37.31 41/42 43/39 35/39

6 1/2

 aluminum oxide
quartz

1.544-1.553 U

40.33

 42/43 42/43 38/42

7

 cerium oxide
mikrokristalinquartz

1.53 to 1.54 U

 - - - -

6 - 7

 cerium oxide
scapolite

1.54-1.58 U-

 40 42/43 42/43 38/42

6

 aluminum oxide
sphen 1.89-2.02 35.5 38/41 35/41 37/41 5 1/2 aluminum oxide
spinel

1.712

 35.55 40/42 37/42 35/39

8

 diamond powder
spodumen

1.66-1.68 B+

 37 - - -

7

 cerium oxide
tanzanite(zoizite)

1.69-1.70 B+

 35 40/42 43/39 35/39

6 1/2

 aluminum oxide
topaz

1.61to1.64 B

 38.4 41/42 43/39 36/40

8

 diamond powder
tourmaline

1.62to1.65 U

 38.12 41/42 43/39 36/40

7

 diamond powder
zircon

(1.78-1.84)(1.93-1.99)U

 33.54 37/41 35/41 36/40

6 1/2 - 7 1/2

 aluminum oxide