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03/05/2021 05:32 pm
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RARE DARK BRIGHT MEMEZO OPAL -ETHIOPIA 12.80 CTS [COLL4]

Artikelnummer
Abmessungen (mm)
16.700 x 5.000 x 9.400mm
Gewicht (cts)
13.000
Typ
Cabochon
Farben

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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Rest der Welt
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volcanicopals
VOLCANIC OPALS is run by Paul sedawie of Seda Opals.The Seda Opal company was incorporated in 1994.The owner Paul sedawie is the current president of the OPAL ASSOCIATION INC .Seda Opals is an abbreviation from our surname Sedawie. The business is mainly wholesale and it is through this site that we can bring the opal fields and the bargins direct to you. Paul Sedawie started mining at the Four mile field in Lightning Ridge in 1986 with his first partner Bob Young. It took them 6 months to find a decent stone and this experience gave me a healthy respect for the stone and how hard it is to find. Previous to mining opal, Paul ran a successful mail order business in plants for 7 years which gave him a lot of experience servicing customers through parcel post. We use mainly Australia post as it has a excellent reputation for delivery to most parts of the world. I don't do any active mining now but my eldest son Peter Sedawie has taken over. This leaves me free to travel to any opal field in the world and to enjoy the beauty of this magnificent stone. We hope you enjoy our stock and good luck with your biding We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
:Stadt Land
Verifiziert
:gesamtes Feedback

  • moss
    moss
    Positiv

    Excellent thank you

  • rreissne
    rreissne
    Positiv

    Thank you for the nice stone!

  • rreissne
    rreissne
    Positiv

    Thank you for the nice stones!

  • rreissne
    rreissne
    Positiv

    Thank you for the nice stone!

Prüfung

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Überblick

Auflistungstyp : Standard
Produkt ID : 826484
Beginnt : 3rd May 2021 04:25 pm PDT
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