THE PREMIER MARKETPLACE FOR REAL OPALS
$92.00 USD
價格

BRIGHT WELO OPAL -ETHIOPIA 2.05 CTS [VS2201 ]

6386
12

存貨單位
尺寸(毫米)
14.000 x 8.000 x 5.000mm
重量 (cts)
2.000
類型
Cabochon
顏色

 header main 

 "WELO"  FIELD OPAL ETHIOPIA

This natural untreated stone that is  from a stunning new field in the WELO area of Ethiopia.This material is  hydrophane so always let the stone dry out slowerly if it gets wet and do not place under  strong  hot lights.This is a well polished high dome stone suitable for a ring or pendant.

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

Transulant with silky  white base tone.

Body tone N-7

Brightness out of 5 -4.5

Hydrophane

 

 

 

Opal Body Tone Scale as per recommendation by the Australian Opal and Gem Industry Association Ltd.
opal color guide
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.

運輸商 運送至:國家 運送到世界其他地區
FedEx $12.00 / :幾天天 $39.00 / :幾天天
:國家
FedEx訂單折扣為$12.00 2或更多商品
世界其他地區
FedEx訂單折扣為$39.00 2或更多商品
Registered Shipping $9.00 / :幾天天 $16.00 / :幾天天
:國家
Registered Shipping訂單折扣為$9.00 2或更多商品
世界其他地區
Registered Shipping訂單折扣為$16.00 2或更多商品

sedaopals
sedaopals
Discover the magic of opals at SedaOpals, where every stone tells a unique story. Paul Sedawie, the heart and soul of SedaOpals, began his journey with a humble piece of boulder rough at 14, sparking a lifelong passion for these mesmerizing gemstones. With over 40 years in the opal industry, Paul’s dedication has taken him from the rugged landscapes of Lightning Ridge to prestigious gem shows around the world. Paul, a former president of the Opal Association and an author of several opal books, shares his vast knowledge and passion with enthusiasts globally. He’s even made the largest donation of opalized fossils and curiosities to the Australian Opal Centre at Lightning Ridge. At SedaOpals, Paul and his sons offer a meticulously curated collection of opals, each handpicked for its exceptional beauty and character. Whether you’re a seasoned collector or new to the world of opals, you’ll find a stunning array of black opals, boulder opals, and crystal opals to explore. Join us in celebrating the timeless beauty and craftsmanship of opals. Welcome to SedaOpals, where every opal is a piece of art.
:城市,國家
已驗證
:總反饋

  • pompey27
    pompey27
    積極的

    And to this stone is good

  • pompey27
    pompey27
    積極的

    Very good, good choice, thanks

  • pompey27
    pompey27
    積極的

    Happy Christmas, good stone thank you!

10%
優惠券代碼 SEDADEALS
有效期至
2nd Jan 2025

審計

Opal Sheriff計畫允許我們的會員要求對任何產品進行審核,該審核由獨立的Gemologist人員完成,該資格人員評估商品描述和圖片的準確性。

送貨細節

船運:
$16.00 21透過Registered Shipping計算天數
發貨自:
Australia

付款方式

  • paypal
  • stripe
  • gempay
該賣家在Australia交易中加入了10.00%稅。

概述

列表類型 : Standard
產品編號 : 216705
開始 : 23rd December 2024 03:00 pm PST
* 所有價格均以:貨幣為單位