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UNTREATED
BLUE SAPPHIRE NATURAL
COLOR
Hardness 9 |
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SAPPHIRE BLUE
| Chemical properties:
corundum is composed of pure alumina; its colouring is due to metallic | | oxide traces or inclusions. The color of sapphire, due to iron and titanium oxide, gives its best | | effect under daylight. Electric light makes it often dark. | | Gems are generally found in alluvium, but come either from basaltic slags, or from metamorphized
marble. | | | | | | 1.30 cts.
Cushion natural blue sapphire single | | |
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SAPPHIRE BLUE |
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Scale determining the purity of a stone.
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| FL |
NFL |
SI1 |
SI2 |
MI1 |
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| Flaw
less |
Near
flaw less |
Slightly
included 1 |
Slightly
included 2 |
Medium
included 1 |
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| MI2 |
MI3 |
VI1 |
VI2 |
HI |
 |
 |
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 |
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| Medium
included 2 |
Medium
included 3 |
Very
included 1 |
Very
included 2 |
Highly
included |
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