Index. 335
PAGE.
Red Diamonds ...... ...... ·· 136
Reflection of light ............ 314
---------from Diamonds ... ... ... ·· 57
Refraction of light ...... ... ··· 314
---------by Diamonds ......... 56
Refraction, double ............ 316
Regent Diamond ............ 128
Rhodes, Porter, Diamond ......... 89
Rhodonite ............... 290
Ribband Agate ............... 236
---------Jasper ... ... ... ... ... 272
River-diggings for Diamonds ... ...... 80
Roberts, Austen, Prof., on Diamonds...... 67
Robinson Diamond mine ... ... ... 94
Rock Crystal ............... 291
Rogers, on Diamonds ............ 67
Röntgen rays, use of in testing gems ... ... 61
Roscoe, Sir H., on Diamonds......... 69
Rose, Gustav, on Diamonds ... ... ... 68
Rose Diamonds ... ... ... ... ... 30
Rousseau, on Black Diamonds......... 72
Rubellite (Tourmaline)............300—302
Ruby .................. 148
---------Burma ............... 153
---------Ceylon ............... 159
---------Siam ... ... ... ... ... 160
Rudd, Mr., on the separation of Diamonds ... 88
Russian Diamonds ............ 133
---------Emeralds ... ... ... ... ... 207
---------Meteorites ............ 73
Sagenite (Rutile in Quartz) ......... 292
Salzburg Emeralds ............ 208
Sand in Stones ............... 43
Saphir d'Eau ... ........ ... 268
