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BRIGHT HONEYCOMB WELO OPAL -ETHIOPIA 4.64CTS [VS5348 ]

SKU
Dimensions (mm)
14.000 x 12.000 x 5.000mm
Weight (cts)
4.640
Type
Cabochon
Colours

  

 “WELO”  FIELD OPAL ETHIOPIA

This natural untreated stone that is  from the Welo area of Ethiopia.This is a well polished high dome stone suitable for a ring or pendant.

It is showing hot neon  multi colours of   GREEN ORANGE RED.

Transulant with silky  caramel base tone.

Body tone N-5

Brightness out of 5 -4.5

Hydrophane

Weight 4.64 cts app

Size 14 X 12 X 5 mm app

THIS IS A WELL POLISHED HIGH DOME STONE SO YOU WILL SEE THE REFLECTION FROM THE LIGHTS

 

 

 

Opal Body Tone Scale as per recommendation by the Australian Opal and Gem Industry Association Ltd. Briliance Scale: 1 Faint, 2 Dull, 3 Bright, 4 Very Bright, 5 Brilliant - Gem Quality

This is what the GIA has to say about this type of opal

 

 

 

 

New Play-of-Color Opal from Welo, Ethiopia

A new source of high-quality play-of-color opal was discovered in early 2008 in Welo Province, Ethiopia, about 500 km north of Addis Ababa. This deposit is geographically distinct from the Mezezo deposit in Shewa Province, which was discovered in the early 1990s (see, e.g., Spring 1994 Gem News, pp. 52–53).

These contributors examined a parcel of about five rough and 30 cut Welo opals. The cabochons showed good play-of-color ; the vast majority were white and transparent, but some had a bodycolor varying from light yellow to dark “chocolate” brown. Compared to Mezezo opals (e.g., J.-P. Gauthier et al., “L’opale d’Ethiopie: Gemmologie ordinaire et caractéristiques exceptionnelles,” Revue de Gemmologie a.f.g., No. 149, 2004, pp. 15–23), those from the new deposit generally appear much whiter. We noted all spectral colors in the play-of-color in our samples. Most of the cabochons were similar in appearance to opals from Australia or Brazil. However, many samples displayed a columnar structure of play-of-color opal within common opal (figure 2), as first described in material from Mezezo (again, see Gauthier et al., 2004). This feature is only very rarely observed in opals from sources outside Ethiopia.

The hydrostatic SG of the opals ranged from 1.80 to 2.10. This broad range is in part due to the high porosity of some samples, as revealed by a significant weight increase after immersion in water (up to 8%). Fluorescence varied from inert to moderate yellowish white to both long- and short-wave ultraviolet (UV) radiation. Samples that were inert displayed an unexpected greenish phosphorescence of moderate intensity. No luminescence was observed in the opals with a yellow-to-brown bodycolor, even the light ones; these darker bodycolors are probably due to the presence of iron, which quenches luminescence. The yellow-to-green luminescence is likely due to the presence of uranium (E. Gaillou et al., “The geochemistry of gem opals as evidence of their origin,” Ore Geology Reviews, Vol. 34, 2008, pp. 113–126). Fourier-transform Raman spectra were obtained for several samples using a Bruker RFS 100 spectrometer. All spectra were consistent with opal-CT, with Raman bands at about 1070, 780, 670, and 345 cm-1, and water-related bands at about 3200 and 2950 cm-1.

Welo opal is found in volcanic rock, possibly a rhyolite. The rough samples we examined consisted of opal (either common or play-of-color) cementing fragments of the host rock. By contrast, opal from Mezezo fills cavities in rhyolite, forming nodules. Despite these differences, the fact that columnar structures are seen in opals from both deposits (but very rarely from elsewhere) seems to indicate similarities in the conditions of their formation.

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sedaopals
sedaopals
Seda Opals: 35 Years of Opal Expertise, Direct to You! UP TO 8 WINS IN NR AUCTION IN 3 DAYS Welcome to Seda Opals, a trusted family-owned business with a rich history in opal mining, cutting, and sales. Founded by Paul Sedawie, who also serves as the current president of the Opal Association Inc., our company is fueled by over three decades of experience. While we recently closed our retail shop/museum at the Gold Coast Opal, we've shifted our focus exclusively to online operations. Through this platform, we bring the opal fields and incredible deals straight to you. Our primary emphasis lies in wholesaling, allowing us to provide you with exceptional value. Paul Sedawie embarked on his opal mining journey in 1986 at the Four Mile field in Lightning Ridge, alongside his first partner, Bob Young. It took them six months to uncover a remarkable stone, instilling in Paul a deep respect for the precious gem and the challenges it presents. Today, Paul's eldest son, Peter Sedawie, has taken the reins, while Ross manages our site. This grants Paul the freedom to travel to various opal fields and revel in the breathtaking beauty of this magnificent stone. The youngest member of our family business, Ross Sedawie, has been immersed in the world of opals since his earliest days. His extensive knowledge and understanding of opals ensure you're in capable hands. At Seda Opals, we stand firmly behind our products, offering a 100% money-back guarantee on all purchases. We sincerely hope you enjoy our offerings and wish you the best of luck with your bidding.
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Overview

Listing Type : Standard
Product ID : 701864
Starts : 20th February 2024 08:32 pm PST
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