|Dimensions (mm)||not provided|
|Weight (carats)||4 carats|
PRASE GREEN OPAL
This is a natural untreated polished green opal i purchased on my last trip to Tanzania.Production is very limited of this material.This stone is showing some dendritic inclusions
Weight 4.19 cts app
Size 18 x 8 x 5 mm app
Prase opal is a nickel-bearing variety of common opal, with nickel being the chromophore that illuminates the neon bluish-green hue. Chrysoprase and prase opal can be similar in appearance but can easily by separated by varying RI and SG. Both varieties range from low-quality opaque material to high-quality translucent jewels; however, the prase opal tends to be more translucent and gemmy.
Chrysoprase and prase opal have been mined on Iyobo Mountain in central Tanzania for more than 20 years, with the first accounts being described by Gübelin in 1975. The most recent discovery revealed some of the most intense and beautiful bluish green material to be seen by the gem trade. The majority of the production is in the chrysoprase form, while the prase opal is the more rare find from this deposit. Chrysoprase and prase opal both form in discontinuous veins within metamorphosed ultramafic rocks with the most dominant host rock being altered serpentine.
Absolutely gorgeous! Two will be made into stunning gold earrings (drops) paired with freshwater pearls. Special order - I'm sure Walter's wife will be thrilled - she loves opals.6.70 CTS PARCEL OF TREATED WELO OPAL [VS7298 ]
|Starts||2nd Dec 2016 9:03pm PST|
|Ends||6th Dec 2016 9:00pm PST|
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