18.60 carats Australian Rough Opal Rough- 3.72 g - (6)
05
days
17
hours
47
minutes
55
seconds
6 other people are watching this object
 Bidder 6372 | €1 |
|---|
Catawiki Buyer Protection
Your payment’s safe with us until you receive your object.View details
Trustpilot 4.4 | 122986 reviews
Rated Excellent on Trustpilot.
Six pieces of natural rough opal from Lightning Ridge, Australia, weighing 3.72 g in grezzo form, with dimensions approximately 14–20 mm.
AI-assisted summary
Description from the seller
Please note that the photos were taken on both dry and wet opal. Obviously, the wet opal is brighter and more colorful, highlighting the effect that can be achieved after polishing. In Australian mining practice, rough opal is conventionally photographed wet, not to mislead buyers, but to represent the potential of the stone. For this reason, we encourage you to carefully evaluate the photographs before bidding. Thank you for your attention and happy bidding!
Natural Australian Rough Opal
Dimensions from approximately 14 to 20 mm.
Pictures taken with a 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%. Furthermore, it is this permeability to water that makes it a hydrophile.
Opals are deposited at relatively low temperatures and can occur in the fissures of almost any type of rock, most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals display a variable interplay of internal colors.
At microscopic scales, precious opal is composed of silica spheres approximately 150 to 300 nm in diameter arranged in a hexagonal or cubic close-packed lattice. These ordered silica spheres produce the internal colors by causing interference and diffraction of light passing through the microstructure of the opal.
Please note that the photos were taken on both dry and wet opal. Obviously, the wet opal is brighter and more colorful, highlighting the effect that can be achieved after polishing. In Australian mining practice, rough opal is conventionally photographed wet, not to mislead buyers, but to represent the potential of the stone. For this reason, we encourage you to carefully evaluate the photographs before bidding. Thank you for your attention and happy bidding!
Natural Australian Rough Opal
Dimensions from approximately 14 to 20 mm.
Pictures taken with a 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%. Furthermore, it is this permeability to water that makes it a hydrophile.
Opals are deposited at relatively low temperatures and can occur in the fissures of almost any type of rock, most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals display a variable interplay of internal colors.
At microscopic scales, precious opal is composed of silica spheres approximately 150 to 300 nm in diameter arranged in a hexagonal or cubic close-packed lattice. These ordered silica spheres produce the internal colors by causing interference and diffraction of light passing through the microstructure of the opal.
Details
Number of items
6
Main Mineral
18.60 carats Australian Rough Opal
Mineral Form
Rough
Weight
3.72 g
Origin (Region/ City)
Lightning Ridge
Country of Origin
Australia
