7.2 ct opal boulder Freeform- 3.99 g - (2)
05
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09
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51
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12
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Starting bid
€ 1
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Selected by Antonio Rapisarda
Holds a master’s in chemistry with 25 years’ experience in minerals consulting.
Estimate € 150 - € 200
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Two opal Boulder gemstones totaling 7.2 carats, in free form, set in 925 silver, from Queensland, Australia.
AI-assisted summary
Description from the seller
Two Boulder opal gems totaling 7.2 carats. They are set in 925 silver. They originate from Queensland, Australia.
This opal is one of the most fascinating, beautiful and sought-after in the world. The iron host rock does not separate from the gem, forming a single, indivisible piece.
They were formed through an exceptional geological process that took millions of years, during the Cretaceous period.
Water rich in siliceous minerals penetrated cracks in the host rock; this water slowly dried, crystallizing into micro-spheres of silicon dioxide, giving rise to the opal stuck to the host rock where it formed.
Its characteristic shine occurs when light penetrates these perfectly ordered micro-spheres, producing the diffraction of light. A wonderful optical prism-like effect that generates that impressive play of colors.
Customs charges outside the EU will be borne by the auction winner.
Seller's Story
Thousands of years ago, in the ancient cities of Greece, the AGORA was the heart of the community. It was not just a market; it was the place where people gathered to share ideas, discover the world, and marvel at knowledge.
Today, that spirit is reborn, but on a much larger scale. Welcome to AGORA.
Our story doesn't begin decades ago, but billions of years ago. It begins in the vacuum of space, where the violent birth of a star forged the METEORITES that you can touch with your own hands today. It continues beneath the Earth's crust, where the patience of the Earth combined heat, pressure, and time to sculpt the perfect geometry of the MINERALS. And finally, it meets us through ARCHAEOLOGY: the fragments of vases, tools, and coins that our ancestors left behind as clues to who we are.
At AGORA we believe that the most valuable objects are not those that shine on the outside, but those that have a story to tell. We are not just a store; we are a meeting point between the cosmos, the Earth, and humanity.
Each piece in our display cases is an authentic fragment of eternity. A witness of the Big Bang, a secret buried for millennia, or a relic of a lost civilization. Entering here is the beginning of a journey through time. We invite you to discover your own fragment of history.
Translated by Google TranslateTwo Boulder opal gems totaling 7.2 carats. They are set in 925 silver. They originate from Queensland, Australia.
This opal is one of the most fascinating, beautiful and sought-after in the world. The iron host rock does not separate from the gem, forming a single, indivisible piece.
They were formed through an exceptional geological process that took millions of years, during the Cretaceous period.
Water rich in siliceous minerals penetrated cracks in the host rock; this water slowly dried, crystallizing into micro-spheres of silicon dioxide, giving rise to the opal stuck to the host rock where it formed.
Its characteristic shine occurs when light penetrates these perfectly ordered micro-spheres, producing the diffraction of light. A wonderful optical prism-like effect that generates that impressive play of colors.
Customs charges outside the EU will be borne by the auction winner.
Seller's Story
Thousands of years ago, in the ancient cities of Greece, the AGORA was the heart of the community. It was not just a market; it was the place where people gathered to share ideas, discover the world, and marvel at knowledge.
Today, that spirit is reborn, but on a much larger scale. Welcome to AGORA.
Our story doesn't begin decades ago, but billions of years ago. It begins in the vacuum of space, where the violent birth of a star forged the METEORITES that you can touch with your own hands today. It continues beneath the Earth's crust, where the patience of the Earth combined heat, pressure, and time to sculpt the perfect geometry of the MINERALS. And finally, it meets us through ARCHAEOLOGY: the fragments of vases, tools, and coins that our ancestors left behind as clues to who we are.
At AGORA we believe that the most valuable objects are not those that shine on the outside, but those that have a story to tell. We are not just a store; we are a meeting point between the cosmos, the Earth, and humanity.
Each piece in our display cases is an authentic fragment of eternity. A witness of the Big Bang, a secret buried for millennia, or a relic of a lost civilization. Entering here is the beginning of a journey through time. We invite you to discover your own fragment of history.
Translated by Google TranslateDetails
Number of objects
2
Main mineral
7.2 ct opal boulder
Mineral form
Freeform
Supplement
Money
Weight
3.99 g
Origin (region/city)
Queensland
Country of origin
Australia
Disclaimer
It is believed that certain gemstones and minerals have beneficial health and spiritual properties. However, using or wearing gemstones or minerals does not mean that you can treat, cure or prevent any disease. Please consult your health care professional for information on health care issues and do not stop any medications or courses of treatment, without first consulting your health care professional. The use of gemstones or minerals as a wellness therapy is one of personal choice. While stones or crystals have been used historically to relieve or prevent symptoms, the objects sold on our website offer no guarantee of results. Therefore, Catawiki cannot guarantee or be held liable for the effectiveness of these objects sold herein.
It is believed that certain gemstones and minerals have beneficial health and spiritual properties. However, using or wearing gemstones or minerals does not mean that you can treat, cure or prevent any disease. Please consult your health care professional for information on health care issues and do not stop any medications or courses of treatment, without first consulting your health care professional. The use of gemstones or minerals as a wellness therapy is one of personal choice. While stones or crystals have been used historically to relieve or prevent symptoms, the objects sold on our website offer no guarantee of results. Therefore, Catawiki cannot guarantee or be held liable for the effectiveness of these objects sold herein.
