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B
birefringence
C
carbonates, measuring RI
composite gems
D
diffusion-treated sapphire case study
disclosure of treatments (Montana Sapphire)
Dry Cottonwood Creek, map containing (Montana Sapphire)
Dry Cottonwood Creek alluvial sapphire mining (photo) (Montana Sapphire)
double refraction
E
El Dorado Bar, map containing (Montana Sapphire)
F
furnaces for heat treating gemstones (Montana Sapphire)
G
garnet rough from Montana (Montana Sapphire)
garnet rough, separating from pink sapphire case study
garnet-topped doublets
gueda rough from Sri Lanka (Montana Sapphire)
H
Hanneman Refractometer, tool for measuring RI
heat treatment (Montana Sapphire)
heavy liquids
Hodgkinson Method, technique for measuring RI
hydrostatic measurement of specific gravity
I
identification game
image doubling, means of detecting birefringence
immersion liquids
L
lustre, means of measuring RI
O
optical sign, means of identification
optical sign, measuring
P
peridot, varying optical sign
photographic tools
polarizer eyepiece for refractometer, tool for detecting small birefringence
polarizers, crossed, means of detecting crystal assymmetry
R
refractive index, about
refractometer (TIR), simulation of
returns policy for Gem Market
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rhodochrosite, measuring RI
Rock Creek, map containing (Montana Sapphire)
rough corundum crystals (Montana Sapphire)
S
scapolite, distinguishing from quartz using TIR refractometer
shipping policy for Gem Market
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silver jewellery (Hayden & Hudson, Ltd)
specific gravity, about
specific gravity, hydrostatic measurement of
Sri Lanka rough (gueda) (Montana Sapphire)
synthetic sapphire, identification of, using TIR refractometer
synthetic spinel doublet
T
topaz, simulation of RI and DR measurement
Y
Yogo Gulch, map containing (Montana Sapphire)
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