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Gemtype Color Shape Weight Size Date Clarity Price Origin
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ID: 2496675 pcs
3.60ctw Opal Doublet
7.93 x 5.96 x 1.64mm
USD 16.20
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ID: 3630421 pcs
1.41ct Opal Doublet
8.57 x 2.49mm
USD 26.21
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ID: 3577861 pcs
5.53ct Opal Doublet
17.04 x 13.23 x 3.26mm
USD 35.94
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ID: 3579141 pcs
8.17ct Opal Doublet
25.51 x 13.52 x 3.18mm
USD 53.10
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ID: 4206541 pcs
2.33ct Opal Doublet
12.74 x 8.94 x 2.26mm
USD 37.28
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ID: 4004014 pcs
1.85ctw Opal Doublet
7.07 x 4.88 x 1.82mm
USD 33.80
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ID: 4207141 pcs
3.89ct Opal Doublet
17.88 x 8.25 x 2.56mm
USD 62.24
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ID: 3915922 pcs
9.53ctw Opal Doublet
21.91 x 9.72 x 2.47mm
USD 211.09
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ID: 3636684 pcs
1.96ctw Opal Doublet
6.91 x 4.92 x 1.77mm
USD 37.38
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ID: 4207171 pcs
3.26ct Opal Doublet
16.17 x 9.74 x 2.35mm
USD 52.16
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ID: 3699594 pcs
3.77ctw Opal Doublet
8.23 x 6.11 x 2.40mm
USD 69.37
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ID: 3577841 pcs
9.72ct Opal Doublet
20.68 x 17.26 x 3.60mm
USD 63.18
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ID: 3636764 pcs
2.02ctw Opal Doublet
7.02 x 5.07 x 1.88mm
USD 38.52
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ID: 2940684 pcs
2.00ctw Opal Doublet
6.90 x 4.97 x 1.57mm
USD 60.00
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ID: 39153512 pcs
4.00ctw Opal Doublet
6.04 x 4.02 x 1.69mm
USD 67.24
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ID: 3915942 pcs
9.35ctw Opal Doublet
15.23 x 2.46mm
USD 207.10
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ID: 2940504 pcs
2.37ctw Opal Doublet
7.14 x 5.12 x 1.68mm
USD 71.10
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ID: 3623314 pcs
2.52ctw Opal Doublet
8.09 x 5.10 x 2.00mm
USD 46.04
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ID: 39160420 pcs
7.43ctw Opal Doublet
6.18 x 4.09 x 1.75mm
USD 124.90
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ID: 4206131 pcs
8.47ct Opal Doublet
20.04 x 14.31 x 3.07mm
USD 135.52
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ID: 3579131 pcs
8.91ct Opal Doublet
20.38 x 17.50 x 3.49mm
USD 57.92
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Opal Doublet
More than any other gem, each opal is distinctly an individual. No other stone has as rich and varied a folklore. Opals are also the most delicate gems commonly worn. They require special care to insure their health and longevity.

Opal's fire was long thought to be the result of iridescence. However, with the advent of scanning electron microscopes, we now know that it is a result of diffraction.

Opal is relatively soft, with a rating of 5.5-6.5 on the Mohs Scale. Despite its frequent use in rings, opal is a poor choice for a ring stone; it is much better suited to earrings, pins, and pendants.

Major suppliers include Australia, Brazil, Mexico, and the US. Values are normally determined by the presence and nature of color flashes.

An opal doublet consists of a slice of opal glued to a black backing, designed to imitate the appearance of a solid black opal. Adhering the slice of opal to a black backing causes the colour to become much darker and more vibrant. Opal doublets are highly regarded as an inexpensive alternative to solid opals which are very expensive in larger sizes.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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