|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
MINERAL GEM WORLD
This is a natural untreated rough piece of ametrine rough from Bolivia .It has some natural inclusions making it a interesting specimen.
Weight 89.00 cts app.
Size 38.9 x 21.3 x 18.4 mm app
We have cut some stones from this parcel which can be seen at our sister site
Ametrine, also known as trystine or by its trade name as bolivianite, is a naturally occurring variety of quartz . It is a mixture of amethyst and citrine with zones of purple and yellow or orange. Almost all commercially available ametrine is mined Bolivia although there are deposits being exploited in Brazil and India
The colour of the zones visible within ametrine is due to differing oxidation states iron within the crystal. The different oxidation states occur due to there being a temperature gradient across the crystal during its formation.
Artificial ametrine can be created by differential heat treatment of amethyst.
Most ametrine in the low price segment can surely be assumed to stem from synthetic material. Since 1994 a Russian laboratory has perfected the industrial production of bicolored quartz crystals that are later irradiated to bring out the typical ametrine colors. Green-yellow or golden-blue ametrine does not exist naturally.
Nice polish, brighter in the picture but still beautiful, rough on the bottom, very pretty, fast shipping and speedy service, thank you.125 CTS LARGE LABRADORITE POLISHED SLAB [MGW 2323 ]
Wow, SO beautiful, as per usual the shipping and customer service were excellent and I can't wait to make a creation with this gorgeous piece.29.15 CTS OPAL FLUORITE 'TIFFANY STONE' [MGW707]
|Starts||15th Jan 2018 5:00pm PST|
|Ends||17th Jan 2018 5:00pm PST|
|Registered Shipping||$19.00||10 Days|
|Standard Shipping||$4.00||21 Days|
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