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4993
5

8.5 SIZE STUNNING WELO OPAL WITH 6 TANZANITES [SOJ3155]

SKU
寸法(mm)
10.000 x 8.000 x 4.000mm
重さ (CT)
3.000
Ring Size
8.5

STYLISH WELO OPAL WITH TANZANITE RING

This is a stylish stunning dress ring with a natural Ethiopian opal enhanced by 6 tanzanites on the side.I buy the Tanzanites from the mines in Arusha Tanzania and they are checked by our in house gemologist .The opal has a beautiful pastel colour which sparkle when moved.

The workmanship and quality is excellent.

Sterling silver

Stamped 925

Size of opal10x8 mm app

Weight of opal 3 cts app

Size of tanzanites 4 mm app

Ring size[USA] :8.5

More Information

Tanzanite is an extraordinary gemstone. It occurs in only one place worldwide -Tanzair africa. Its blue, surrounded by a fine hint of purple, is a wonderful colour. Thanks to its unusual aura and the help of the New York jeweller’s Tiffany, it has rapidly become one of the most coveted gemstones in the world.

Tanzanite is a blue variety of the gemstone zoisite. It consists of calcium aluminium silicate and is not particularly hard, having a value of 6.5 to 7 on the Mohs scale. For that reason, it should always be worn carefully and never placed in an ultrasonic bath for cleaning or brought into contact with acids.

The deep blue of the tanzanite is fantastic, and runs from ultramarine blue to light violet-blue. The most coveted colour is a blue surrounded by a delicate hint of purple, which has a particularly wonderful effect in sizes of over 10 carats. The well developed polychromaticity of the tanzanite is typical: depending on the angle from which you look at it, the stone may appear blue, purple or brownish-yellow. Having said that, most raw crystals are somewhat spoiled by a brownish-yellow component, though it can be made to disappear by the cutter if he heats the stone carefully in an oven to approximately 500°. During the procedure he must pay careful attention to the moment at which the colour turns to blue. This burning is a method of treatment which is regarded as customary in the trade, but the raw stones must be as free of inclusions as possible, since otherwise fissures may occur. In fact working with tanzanite can sometimes give even the most experienced cutter a bit of a headache, the cleavage of this gemstone being very pronounced in one direction. This exclusive gemstone is cut in every imaginable shape from the classical round shape to a number of imaginative designer cuts.

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.

More Information

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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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  • irenesini
    irenesini
    ポジティブ

    As described. Thank you.

  • eliax
    eliax
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    Extremely good communications and very fast with shipping, item as described thank you!

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21st Apr 2024

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リストタイプ : Standard
製品番号 : 405037
始まります : 27th March 2024 09:00 pm PDT
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