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$2.50
當前出價
2
出價
關閉
09/10/2008 04:00 pm

NATURAL FRESH BLACK WATER PEARLS 160 CTS GW 2004ML

2
223
0

存貨單位
尺寸(毫米)
x x mm
重量 (cts)
Shape
Pear
顏色

DESCRIPTION:

 

Gem Type:NATURAL PEARLS

Weight (CARATS): 160 CTS

 

Origin:VIETNAM

SIZE (mm): 7 X 8 X 8 MM

 

Color: BLACK

 

Shape: ROUND

Clarity:VVS

Treatments:DYED

Additional Comments:

PIECES- 1 STRAND
THIS GEM STONE IS NOW IN AUSTRALIA AND WILL BE SHIPPED FROM THERE SO PLEASE BE PATIENT FOR YOUR DELIVERY

 

 

ARTIFICIAL BLACK DYEING WITH SILVER SALT: Treatment with silver nitrate solutions (AgNO3) is applied since the nineteen thirties to Japanese Akoya cultured pearls. The method was used at the end of the 19th century in the mother-of-pearl industry and natural pearls were also dyed this way.
The pearls are immersed for a period of several days or weeks to several months in diluted silver nitrate solution (the dilution ratio is 3 to 4 per cent) and are kept in a dark room. After this, they are exposed to a strong light source (either sun light or artificial light) or they are treated with hydrogen sulphate. Both methods lead to the deposition of metallic silver in an extremely fine distribution in the pearl, causing the dark color. The method enables the production of lighter or darker hues, depending on the quantity of silver produced. An immersion period of several months is required in order to produce truly black colors while shorter periods lead to more brownish or grayish hues.

This means that the nucleus remains white, while the outer pearly layer takes on the dark color. The deposition of silver seems to concentrate in the conchioline layer which is often present between the nucleus and the pearly layer. The distribution of silver gets less towards the surface of the pearl. In the case of undrilled pearls diffusion of silver oxide starts however from the surface while in the case of drilled pearls the silver solution will more directly find its way to the border area between nucleus and outer pearly layer.

 

7 Pearl Value Factors:

* Size: Pearl size is measured in millimeters. Typically, all other factors being equal, a larger pearl of a certain type is more expensive than a smaller one.
* Shape: There are three main categories to pearl shape: spherical, symmetrical, and baroque. An example of a symmetrical pearl is an oval, while baroque pearls are irregular in shape.
* Color: With cultured pearls, look at body color and, if present, overtone. Bodycolor is the dominant color of the pearl, while overtone refers to one or more translucent colors that overlie the body color (like blush on a woman’s cheek). A third component of some pearls’ color is orient. When present, it looks like a moving iridescence on or just below a pearl’s surface.
* Luster: This is the intensity of light reflected from a pearl’s surface. In general, more lustrous pearls will have a higher value. GIA uses the terms excellent, good, and fair to describe luster on cultured pearls.
* Surface Grading: This factor looks at the blemishes, or surface irregularities, on a pearl. Typical blemishes include bumps, abrasions, and spots; the visibility of the irregularities will affect the cost. Very few pearls, however, are completely free of blemishes.
* Nacre Quality: Fine nacre quality means that a cultured pearl has a reasonable thickness of nacre around the nucleus as well as a high luster.
* Matching : This is the uniformity of appearance in strands and multi-pearl pieces of jewelry, and is judged by the consistency of all of the above factors.

 

 

 

 

 

Type 1 Gemstones
The following gemstones are typically inclusion free, even minor inclusions detract from their value.
Diamond, Amethyst, Beryls(Aquamarine,Morganite), Citrine, Smoky Quartz, topaz, Chrysoberyl, Kunzite, Tanzanite, green Tourmaline, and Blue Zircon
IF Internally flawless under extreme magnification (Very rare)
F Flawless
VVS Minute inclusions under 10x; invisible to the unaided eye
VS Minor inclusions under 10x; usually invisible to the unaided eye
SI1 Noticeable inclusions under 10x; usually visible to the unaided eye
SI2 Noticeable inclusions under 10x; usually quite visible to the unaided eye
I1 prominent- moderate affect on appearance or durability
I2 prominent - severe affect on appearance or durability
I3 prominent- severe affect on beauty, transparency or durability
Type 2 Gemstones
Gemstones that normally have small inclusions that do not detract from value.
Alexandrite, Andalusite, Iolite, Peridot, Rhodolite, Ruby, Sapphire, Spinel, Tourmaline, Garnet, Amethyst, Red Zircon, Tsavorite; Blue, Orange, Purple, Yellow and Parti-colored Tourmaline
F Flawless
VVS Minor inclusions under 10x; usually invisible to the unaided eye
VS Noticeable inclusions under 10x; often invisible to the unaided eye
SI1 Obvious inclusions under 10x; visible to the unaided eye
SI2 Obvious inclusions under 10x; very apparent to the unaided eye
I1 prominent - moderate affect on appearance or durability
I2 prominent - severe affect on appearance or durability
I3 prominent - severe affect on beauty, transparency or durability

 

6 mm = 1/4 inch (Approx)

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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
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  • rocjack1
    rocjack1
    積極的

    Paid and shipped - no feedback left after 60 days

  • reedl
    reedl
    積極的

    Paid and shipped - no feedback left after 100 days

  • talijoon1
    talijoon1
    積極的

    Paid and shipped - no feedback left after 100 days

  • skarastu
    skarastu
    積極的

    Beautiful gemstone. Checked to be genuine Tourmaline. Color was light pink. I was hoping for a pinkish purple as in the pictures. Great transaction and prompt shipping. Thank you.

投標歷史 (2)
rocjack1
16 years ago
$1.50
babybright1
16 years ago
$1.00

審計

Gemstone 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
  • escrow
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 : 51782
起拍價 : $1
開始 : 5th October 2008 04:00 pm PDT
結束 : 9th October 2008 04:00 pm PDT
* 所有價格均以:貨幣為單位