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RARE DARK BRIGHT MEMEZO OPAL -ETHIOPIA 12.80 CTS [COLL4]

1
3892
6

SKU
Afmetingen (mm)
16.700 x 5.000 x 9.400mm
Gewicht (cts)
13.000
Type
Cabochon
Kleuren

This stone in cut in 2009-it was one of the first parcels i bought from this area. it known for its crazing however this parcel was stable.This material is rare as not a lot of dark stones have been found from this filed.This is a well polished high dome stone suitable for a ring or pendant.I cut this stone from rough app 10 years ago.There is one fracture line but it is faint. It is showing hot neon multi colours of BLUE GREEN ORANGE RED. Transulant with silky brown/black base tone. Body tone N-2 with a brown tinge Brightness out of 5 -4.2 Size 16.7 x 15 x 9.4

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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volcanicopals
volcanicopals
Welcome to the colorful journey of Paul Sedawie, a lifelong enthusiast of opals. Paul's fascination with these gemstones began at the tender age of 14 when he acquired his first boulder rough. Entranced by their natural beauty and vibrant colors, Paul embarked on a remarkable adventure in 1989, moving to Lightning Ridge to own an opal claim. Despite the challenges of mining, the experience bestowed upon him priceless memories and a deep respect for the craft. Today, Paul's journey has evolved, transitioning from mining to curating exquisite opals from partnerships and miners worldwide. With a keen eye for quality, he meticulously oversees the cutting process, personally crafting the finest black opals. Together with his sons, Peter and Ross, Paul continues to share his passion for opals with customers globally. Ross, a graduate of the AIGS Gem School, spearheads SEO efforts, while Peter manages worldwide dispatch and opal cutting. As a testament to his dedication, Paul celebrates his 30-year milestone in the opal business in 2019, having sold over 100,000 stones and parcels through Opal Auctions. This E-book offers a glimpse into Paul's extraordinary collection, a culmination of decades spent immersed in the opal industry. With a commitment to preserving Australia's opal heritage, Paul cherishes his personal collection of opal fossils, ensuring they remain in their homeland. Join us in experiencing Paul's passion for opals, and discover the enchanting world of these captivating gemstones. Best regards, Paul Sedawie
Lightning Ridge , Australia
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Vermeldingstype : Standard
Product-ID : 1048077
Geschatte adviesprijs : $5,200.00
Openingsbod : $1,480
Begint : 1st November 2023 05:33 pm PDT
Loopt af : 10th November 2023 02:19 pm PST
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