You can check out the back story and get some indication of how this stone will finish here

https://youtu.be/18o8zkGq1SY

NOTICE: OUR OPAL AUCTIONS SHOP "53FROGS" RUNS HUNDREDS OF NO RESERVE AUCTIONS EVERY WEEK, BUT THEY ARE SPREAD ACROSS OPAL AUCTIONS IN MANY DIFFERENT CATEGORIES. TO SEE ALL OF OUR NO RESERVE AUCTIONS IN ONE PLACE, SEARCH "53FROGS" IN THE OPAL AUCTIONS SEARCH BAR. COMBINED SHIPPING IS AVAILABLE ON ANY ITEMS BOUGHT FROM OUR STORE "53FROGS" AND PAID FOR AT THE SAME TIME. Very pretty gem for a pendant. This solid opal was cut from Queensland Matrix Rough Opal.

There are a few different types of matrix opal found in Andamooka, and this Rainbow matrix is the most porous of them all. It is sometimes called "Concrete" due to the conglomerate embedded within the quartzite matrix and the general resemblance to building concrete in its untreated state. The treatment process darkens the quartzite base so the Opal can be seen more clearly, and the Resin sealing creates an even surface that can be brought to a high polish.

DESCRIPTION:

Item Type: SOLID NATURAL ANDAMOOKA MATRIX OPAL

Origin: ANDAMOOKA Australia

Number of pieces: 1

Treated/Untreated: TREATED-CARBONISED AND RESIN SEALED

Please check out within 7 days of your first win. We cannot hold your package after you check out. Once you check out, your package will be lodged with Australia Post during the next Monday or Thursday shipping window. If standard shipping is chosen, we are not responsible for any lost or damaged items.

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We ship all items within 24 hours of payment. Unless it’s a holiday, we will ship on the next working day.

Shipping Time: ETA 5-21 working days

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Guaranty: Your satisfaction is guaranteed, and you will be offered a no-hassle return. If you are not satisfied, just send back the item within 7 days after you receive it. It will take 2-3 days for us to check the items carefully. A refund will be given as soon as the items are confirmed to be in their original condition. Customers only need to pay for the shipping cost to return the package.