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The mystery of Minerals, brought to you by {name}

Antonio Rapisarda

Natural Ethiopian Rough Opal Colourfull 
Dimensions from 15   mm to 18  mm approx

Pictures taken with high resolution camera on different backgrounds in order to depict the opals as realistically as possible.

Worldwide shipping with registered mail and tracking number.



An opal is a hydrated form of silica with a water content ranging from 3 to 21%.Indeed, it is this permeability to water that makes it a hydrophile.
Opals are deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals show a variable interplay of internal colors.

At microscopic scales, precious opal is composed of silica spheres some 150 to 300 nm in diameter in a hexagonal or cubic close-packed lattice. These ordered silica spheres produce the internal colors by causing the interference and diffraction of light passing through the microstructure of the opal.
Tutti gli articoli vengono fotografati singolarmente con fotocamera ad alta risoluzione ad ingrandimento macro in ambiente interno con illuminazione LED a 5000 gradi Kelvin, la temperatura di colore più vicina alla luce del sole. Le foto non subiscono alcuna modifica, ad eccezione del ritaglio. 
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Restituzione
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Grazie per l'attenzione e Happy bidding!



Well, Ethiopia

Cts. 31.40 Ethiopian Opal Rough Rough- 3.82 g

Minerals & Meteorites

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Material

Silver

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Steel

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Stone (mineral stone)

Agate

Gender

Unisex

Women

Condition

As new - unused

Excellent condition - barely used with minimal signs of wear

Natural

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Good condition - used with some signs of wear

Composed

Very good condition - slightly used with small signs of wear

Good condition - used with small signs of aging & blemishes

Manipulated

Cast

Very good

Near mint

Excellent condition: barely used with minimal signs of wear

Period

Paleogene, Eocene (56 - 33.9 million years)

Paleogene, Oligocene (33.9 - 23.03 million years)

Neogene, Miocene (23.03 - 5.33 million years)

2020+

2025

1960-1970

1970-1980

Cretaceous, Lower (145 - 100.5 million years)

2010-2020

1850-1900

1980-1990

Cretaceous, Upper (100.5 - 66 million years)

Jurassic (201.3 - 145 million years)

Triassic (251.9 - 201.3 million years)

21st century

20th century

Late 20th century

Jade

Turquoise

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Opal

Pearl

Freshwater cultured pearl

Lapis lazuli

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Mixed gemstones

Quartz

Onyx

Sapphire

Citrine

Peridot

Chalcedony

Blood Coral

Ruby

Emerald

Amethyst

Cat's Eye (Chrysoberyl)

South Sea cultured pearl

Topaz

Tourmaline

Certification

No laboratory report

GEM-TECH Istituto Gemmologico

CITES Appendix II - Annex B in the EU

Antwerp Laboratory for Gemstone Testing (ALGT)

Style

Art Deco

Modern

Signature

Not signed

Colour

Green

Transparent

Oval

Baroque

Round

Brilliant cut

Cabochon cut

Minerals & Meteorites

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Cts. 31.40 Ethiopian Opal Rough Rough- 3.82 g

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