Vintage Pear Shaped Tanzanite & White Diamond Necklace on 18k White Gold

Vintage Pear Shaped Tanzanite & White Diamond Necklace on 18k White Gold.



Vintage Pear Shaped Tanzanite & White Diamond Necklace on 18k White Gold

PRESENTING one of the FINEST pieces from our Fine Jewelry Collection…………a Vintage Pear Shaped Tanzanite & White Diamond Necklace on 18k White Gold.

This piece is an Mid-Century piece….probably circa 1960.

It does not bear a makers mark but was UNDOUBTEDLY made by one of the very best jewelers of the time.

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It is marked for 18k white gold.

The chain is linked rondels and simulates bamboo with a strong clasp.

The Pendant is Pear shaped and has its central display a LARGE circa 3.5ct pear shaped Tanzanite in diamond cut.

The Tanzanite stone is the surrounded by a smaller inner row of brilliant cut white diamonds and a larger second row of brilliant cut diamonds all set in 18k white and yellow gold setting......total diamonds circa 2 ct.

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Tanzanite is the blue/violet variety of the mineral zoisite (a calcium aluminium hydroxyl Sorosilicate) belonging to the epidote group. It was discovered by a Tanzanian Jumanne Mhero Ngoma in the Mererani Hills of Manyara Region in Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. Tanzanite is used as a relatively cheap gemstone, where it can substitute for the far more expensive sapphire after undergoing artificial heat treatment to form a deep blue coloration. Naturally formed tanzanite is extremely rare[3] and is endemic only to the Mererani Hills.[4]

Tanzanite is noted for its remarkably strong trichroism, appearing alternately sapphire blue, violet and burgundy depending on crystal orientation.[5] Tanzanite can also appear differently when viewed under alternate lighting conditions. The blues appear more evident when subjected to fluorescent light and the violet hues can be seen readily when viewed under incandescent illumination. Tanzanite is usually a reddish brown in its rough state, requiring artificial heat treatment to bring out the blue violet of the stone.[6]

The mineral was named by Tiffany & Co. after Tanzania, the country in which it was discovered. In 2002, the American Gem Trade Association chose Tanzanite as a December birthstone, the first change to their birthstone list since 1912.

Manuel d'Souza, a tailor and part-time gold prospector living in Arusha (Tanzania), found transparent fragments of vivid blue and blue-purple gem crystals on a ridge near Mererani, some 40 km (25 mi) southeast of Arusha.[8] He assumed that the mineral was olivine (peridot) but after soon realizing it wasn't, he concluded it was "dumortierite", a blue non-gem mineral. Shortly thereafter, the stones were shown to John Saul, a Nairobi-based consulting geologist and gemstone wholesaler who was then mining aquamarine in the region around Mount Kenya. Saul, with a Ph.D. from M.I.T., who later discovered the famous ruby deposits in the Tsavo area of Kenya, eliminated dumortierite and cordierite as possibilities, and sent samples to his father, Hyman Saul, vice president at Saks Fifth Avenue in New York. Hyman Saul brought the samples across the street to the Gemological Institute of America who correctly identified the new gem as a variety of the mineral zoisite. Correct identification was also made by mineralogists at Harvard University, the British Museum, and Heidelberg University, but the very first person to get the identification right was Ian McCloud, a Tanzanian government geologist based in Dodoma.[9][10]

Scientifically called "blue zoisite", the gemstone was renamed as tanzanite by Tiffany & Co., who wanted to capitalize on the rarity and single location of the gem, and thought that "blue zoisite" (which might be pronounced like "blue suicide") wouldn't sell well.[11] Tiffany's original campaign advertised that tanzanite could now be found in two places: "in Tanzania and at Tiffany's".

From 1967, an estimated two million carats of tanzanite were mined in Tanzania before the mines were nationalized by the Tanzanian government in 1971.

There is no universally accepted method of grading colored gemstones. TanzaniteOne, a major commercial player in the tanzanite market, through its non-profit subsidiary, The Tanzanite Foundation,[15] has introduced its own color-grading system.[16] The new system's color-grading scales divide tanzanite colors into a range of hues, between bluish-violet and violetish-blue.

The normal primary and secondary hues in tanzanite are blue and violet. Untreated tanzanite is a trichroic gemstone, meaning that light that enters this anisotropic crystal gets refracted on different paths, with different color absorption on each of the three optical axes. As a result of this phenomenon, a multitude of colors have been observed in various specimens: shades of purple, violet, blue, cyan, green, yellow, brown and red. After heating, tanzanite becomes dichroic. The dichroic colors range from violet through bluish-violet and violetish-blue to blue.[17]

Clarity grading in colored gemstones is based on the eye-clean standard, that is, a gem is considered flawless if no inclusions are visible with the unaided eye (assuming 20/20 vision).[17] The Gemological Institute of America classifies Tanzanite as a Type I gemstone, meaning it is normally eye-clean. Gems with eye-visible inclusions will be traded at deep discounts.

Link: https://en.wikipedia.org/wiki/Tanzanite

 

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This is a STUNNING piece of Vintage Jewelry of the HIGHEST QUALITY !

 

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Vintage Pear Shaped Tanzanite & White Diamond Necklace on 18k White Gold.

The piece cost the private collector from New York a substantial sum in the 1970's.

It was purchased by her from a Fine Jeweler based in Manhattan and Long Island.

This jeweler would visit her at her home in Long Island on a weekly basis to show her fine pieces that she may have been interested in purchasing.

This is why she collected such a FINE RANGE OF HIGH QUALITY AND RARE JEWELRY.

If you are the type of person that likes to acquire ONLY THE FINEST THINGS and in particular jewelry that would have been fit to grace any of the top jewelry houses in the World, then this (and the Collections many other pieces) is for you !

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KINDLY PLEASE NOTE:

For Security Reasons and because of the value of this (and all our other jewelry) WE DO NOT KEEP ANY JEWELRY AT OUR SHOWROOMS.

All our jewelry is held in a safety deposit box in a Dallas Bank.

It is for this reason, that we require any interested buyer to:

(1) contact us in advance, giving 48 hours notice of a potential viewing,

(2) clearly indicate the piece or pieces they are interested in viewing, and

(3) agree on a mutually agreeable viewing 'venue', suitable and secure for any such viewing.

In the event of agreeing to purchase........possession of the piece will not be given over to the purchaser until such time as 'funds' have FULLY CLEARED in our Bank Account.

PERSONAL & INTERNET SALES: The onus is entirely on the buyer to verify the authenticity of the piece and its description by us.

We have used our best endeavors to describe the items correctly, based on the information provided to us.

In some cases, we will provide the buyer with a professional Certificate of Authenticity and appraisal report.

Where we have such a Report we will post in online on our Website in the individual item's post.

Internet Buyers who purchase, without viewing, do so entirely at their own risk without further recourse to us the Seller.

ANY SALE OVER $3,000 USD CANNOT BE COMPLETED BY PayPal or Credit Card and can only be completed by CASH, CASHIERS CHECK or BANK TRANSFER.

SALES UNDER $3,000 USD CAN BE COMPLETED BY PayPal or Credit Card.

By clicking and using the PayPal Button for items over $3,000 will be treated as a non-refundable deposit on items, with the balance to be discharged as per agreement on form of payment by email.

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Vintage Pear Shaped Tanzanite & White Diamond Necklace on 18k White Gold.

Provenance: From our PRIVATE FINE JEWELRY COLLECTION.

Price: $18,750.00. Sale Price Now: $15,000.00

 

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