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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. | | | | | 0.78 cts.
Cushion natural blue sapphire single | | |
| | x | Pieces: |  | 1 Sapphire | x | x | Type: |  | 100% Natural | | | | | | | | | | | Color: |  | Fine
Blue | | | Shape: |  | Cushion faceted | | | | | | | | | | | Weight: |  | 0.78 Carats | | | Size: |  | 5.7
x 4.7 mm. | | | | | | | | | | | Clarity: |  | FL | | | Luster: |  | Excellent | | | | | | | | | | | Treatment: |  | None
(N) | | | Origin: |  | Madagascar | Comment:
Medium-dark blue
color. | | | | | | | | | | | | Refr. Index: |  | 1.76-1.78 | | | Hardness |  | 9 | | | | | | | | Depth:3.1
mm. | |
 |  | Not
treated in any
way. |
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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 |
 |
 |
 |
 |
 |
Flaw
less |
Near
flaw less |
Slightly
included 1 |
Slightly
included 2 |
Medium
included 1 |
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MI2 |
MI3 |
VI1 |
VI2 |
HI |
 |
 |
 |
 |
 |
Medium
included 2 |
Medium
included 3 |
Very
included 1 |
Very
included 2 |
Highly
included |
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