Why does ethiopian opal turned yellow?

Jailyn Boehm asked a question: Why does ethiopian opal turned yellow?
Asked By: Jailyn Boehm
Date created: Thu, May 27, 2021 2:06 AM
Date updated: Tue, Jun 28, 2022 10:56 AM


Top best answers to the question «Why does ethiopian opal turned yellow»

Sometimes Ethiopian opals can turn yellow or brown and lose their fire. This would probably happen because the stone has been allowed to absorb water, which temporarily affects its color and fire. Once the stone is dewatered, it should return to its normal state.

8 other answers

Hydrophane opals can potentially yellow over time due to their porous nature. They can absorb things from our bodies like oil or sweat which cause this discoloration. Generally speaking, you want to care for opals in a similar way to pearl jewelry.

It turned grayish yellow. I reasoned mine was water-logged, so I put it in a very low oven, maybe 130 degrees, for a few hours. In my case it worked, but since yours was in salt water, not plain water, I wouldn't suggest it.

This could be the reason why some areas have higher cracking problem than others and if you follow Ethiopian sellers feedback on opalauctions you will see lot repeat buyers buying , so this location where the opal came from is more stable. Its not scientific but could explain why some parcels of Ethiopian rough produce more stable opals.

This is what the GIA in American said about Ethiopian Opal “This is opal from the Welo region of Ethiopia. It is mainly Hydrophane in that it absorbs water and can change colour. To determine if the opal is hydrophane wet your hand and place it on the top of the Opal. If it sticks to your hand it is hydrophane.

If it wants to stick, it's hydrophane. Ethiopian and mexican sources often are. Soak it in some water and it should clear up. That or it could have been coated in oil or something else to improve color when you bought it.

This is often asked but a lot of Ethiopian opal does have a very strong yellowish appearance. As to wether this increases over time I don’t know. I have pieces put away from the time it first came on the market and although “yellowish” I don’t believe they have changed. Ethiopian opal is often dyed to find new parts of the marketing chain.

Since you say your piece is transparent, I suspect you bought a piece of Welo Ethiopian Opal. My second educated guess is that the greasy substance was mineral oil, popularly used for storing opal. I did a specific set of soak tests on 450 pieces of precious Welo Opal that consisted of soaking them for one hour in 67-degree Fahrenheit water three separate times.

Dyed Ethiopian opal beads: The hydrophane nature of much Ethiopian opal makes it easy to dye. A person who is familiar with opal will probably realize that the outrageous colors of these beads have been produced by dye. People who have seen a lot of opal might be fooled when dye is used to produce a more subtle and believable color.

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