The name Onyx has its origin in the Greek language and means "fingernail", probably because of its weak transparency
Black
onyx is perhaps the most famous variety of onyx, chalcedony. Onyx is formed in
the gas cavities of lava. Black Onyx often comes
purely black but can also have stripes of
gray, red or cream.
Onyx is a gemstone found in various regions of the world, particularly
Brazil, Uruguay, Pakistan, Sri Lanka, India, Hawaii and Madagascar.
Hardness 6.5 to 7.
Onyx Treatments:-
Black chalcedony ("onyx") is assumed to be dyed - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7
Onyx Treatments:-
Black chalcedony ("onyx") is assumed to be dyed - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7
WEIGHT PER PIECE OF BLACK ONYX
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OVAL SHAPE
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MARQUISE SHAPE
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PEAR SHAPE
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ROUND SHAPE
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SQUARE SHAPE
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SIZE
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WEIGHT
|
SIZE
|
WEIGHT
|
SIZE
|
WEIGHT
|
SIZE
|
WEIGHT
|
SIZE
|
WEIGHT
|
5*3MM
|
0.19
|
5*3MM
|
0.15
|
5*3MM
|
0.17
|
1.00MM
|
0.007
|
3*3MM
|
0.09
|
5*4MM
|
0.29
|
6*4MM
|
0.31
|
6*4MM
|
0.34
|
1.25MM
|
0.01
|
4*4MM
|
0.22
|
6*4MM
|
0.38
|
7*5MM
|
0.53
|
7*5MM
|
0.60
|
1.50MM
|
0.016
|
5*5MM
|
0.44
|
7*5MM
|
0.67
|
8*6MM
|
0.85
|
8*5MM
|
0.74
|
1.75MM
|
0.025
|
6*6MM
|
0.76
|
8*6MM
|
1.07
|
9*7MM
|
1.28
|
8*6MM
|
0.96
|
2.00MM
|
0.04
|
7*7MM
|
1.20
|
9*7MM
|
1.60
|
10*8MM
|
1.83
|
9*6MM
|
1.16
|
2.25MM
|
0.05
|
8*8MM
|
1.79
|
10*8MM
|
2.29
|
11*9MM
|
3.81
|
10*7MM
|
1.70
|
2.50MM
|
0.0625
|
10*10MM
|
3.50
|
11*9MM
|
3.15
|
12*10MM
|
3.36
|
12*10MM
|
3.78
|
2.75MM
|
0.076
|
||
12*10MM
|
4.20
|
14*10MM
|
4.27
|
3.00MM
|
0.09
|
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14*10MM
|
5.34
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