Page:Handbook of Precious Stones.djvu/159

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Opal 97, 128

Opalescence 6

Orange stones 23, 44

Orthoclase 105

Oyster, pearl

Pearl 114, 132

Peridot 85, 126

Plasma 101, 130

Phenakite 91

Phosphorescence 97

Premier or Cullinan Diamond 57

Porcelain Jasper 101

Prase 101

Pyrites 111

Pyro-electricity 78

Pyrope 82, 126

Quartz 99, 129

Quartz, avanturine 100

Quartz, rose 100

Quartz, smoky 101

Quoins 26

Red stones 22, 38

Refraction of light 6, 24

Rhodolite 83

Riband Jasper 101

Rock Crystal 99

Rose-cut 29

Rose-opal 98

Rose-quartz 99

Rubellite 75

Ruby 40, 64, 123

Sapphire 63, 65, 123

Sapphirine Quartz 101

Sard 101

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Sardonyx 101

Serpentine 47

Skew Facets 26

Skill Facets 27

Smaragdite 47

Smoky Quartz 101

Sonstadt's solution 14

Specific Gravity 13, 20

Specific Gravities, corrected 18

Spessartite 83

Sphene 107

Spinel 67, 123

Spodumene 96

Star Facets 26, 27

Star-sapphire 62, 123

Step-cut 28

Structure of crystals 21

Sunstone 106, 131

Tables 5-7, 10-13, 20, 22-24

Table-cut 29

Tallow topped 30

Templets 26

Topaz 72, 125

Tourmaline 75, 125

Townshend collection 119

Trap-cut 28

Turquoise 70, 124

Unio 114

Uvarovite 84

Violet stones 24, 46

White stones 22, 36

Yellow Stones 24 44

Zircon 92, 128