Wednesday, 30 November 2016

Rainbow of Africa Collection


A 65.72 carat Tsavorite Garnet
An array of spectacular stones drew enthusiasts to the sale held by Heritage Auctions in New York in 2015. The collection was started by Morton Taylor in the late 1950s.
Pink Spinel from Morogoro Region, Tanzania

A 51.07 carat Cuprian Tourmaline from Mozambique est. $70,000

283 carat Scapolite

41.76 carat Mandarin Garnet from Namibia est. $50,000

293 carat Cuprite.

Color Change Blue Spinel - 14.33 carats, Tanzania.

Morganite - 114.39 carats, Mozambique.

Iolite - 15.12 carats, Madagascar

Red Spinel - 15.87 carats, Tanzania.

Tanzanite - 35.66 carats.

Rubellite Tourmaline - 29.44 carats, Zambia

Aquamarine - 26.47 carats, Zambia

Spessartine Garnet - 12.04 carats, Nigeria

Morganite - 73.59 carats, Mozambique.

Tuesday, 29 November 2016

Crater of Diamonds State Park

Crater of Diamonds State Park is a 911-acre (369 ha) Arkansas state park in Pike County. The park features a 37.5-acre plowed field ... the world's only diamond-bearing site accessible to the public.

The diamond-bearing soil in the search area is plowed periodically to help bring more diamonds to the surface.
The Arkansas Diamond Mine at Crater of Diamonds State Park has a policy of "finders, keepers," meaning the diamonds you find are yours to keep.

Diamonds were first discovered in 1906 when John Huddlestone found two strange crystals in the soil of his farm. His farm was right above a volcanic pipe filled with lamproite.

http://www.craterofdiamondsstatepark.com/
Word of the discovery spread and a "diamond rush" began. Soon thousands of people descended upon the Murfreesboro area, however, the Huddlestone farm and immediately adjacent land was the only location with promise of becoming a diamond mine. The diamond-bearing pipe was several hundred yards in diameter. There are other volcanic pipes in the area but they have yet to yield more than a few diamonds.
Prior to Huddlestone's discovery, geologists at the Arkansas State Geological Survey suspected that diamonds might occur in the greenish peridotite soils near Murfreesboro because they were similar to the soils above the African diamond deposits. They did fieldwork in the area but did not find any diamonds.
Since the park opened in 1972 there have been about 30,000 reported diamond finds. Most of the diamonds found are very small - too small for cutting into a mountable stone. The 30,000 stones reported have an aggregate weight of a little under 6,000 carats, making the average stone about twenty points (.20 carat) in weight.
Although most stones found are small, some spectacular diamonds have been found.

The "Uncle Sam Diamond", the largest diamond ever found in the US, was found there in 1924. This pale brown, 40.23 carat stone was found in 1924 by W.O. Bassum. It was cut into an emerald-cut gem weighing 12.42 carats which was sold in 1971 for $150,000.
The largest diamond ever found by a park visitor was a 16.37-carat white diamond found in 1975, named the "Amarillo Starlight".

The 4.25-carat "Kahn Canary" was worn by first lady Hillary Clinton at her husband's Presidential Inaugural galas in 1993 and 1997 as a special way to represent Arkansas's diamond site. The diamond's owner, Stan Kahn of Pine Bluff, Arkansas, loaned the diamond to Mrs. Clinton.
The "Strawn-Wagner Diamond" was found in 1990 by Shirley Strawn. This 3.09 carat stone was cut into a 1.09 carat brilliant-cut gem. It was the first stone to receive a perfect grade of 0/0/0 by the American Gem Society.

A number of beautiful canary-colored diamonds have been found at the Park. The most famous is the "Okie Dokie Diamond" found in 2006 by Marvin Culver.

Tuesday, 22 November 2016

Beryl


Emerald with Pyrite, Calcite
In geology, beryl is a mineral composed of beryllium aluminium cyclosilicate with the chemical formula Be3Al2(SiO3). Beryls come in a number of varieties including the blue-green aquamarine, yellow-green heliodor, pink morganite, deep green emerald and the extremely rare red beryl.

The name comes from the ancient Greek word beryllos describing a blue-green stone the color of the sea.
Emeralds are a form of beryl, showing the richest green which is caused by trace amounts of chromium and sometimes vanadium.

Emerald has been a favorite of the elite throughout history and was worshiped by Incas and Aztecs.
Its attributes include the ability to foretell the future, bring good luck and protect against illness.

Emeralds in antiquity were mined by the Egyptians and in Austria, as well as Swat in northern Pakistan. A rare type of emerald known as a trapiche emerald is occasionally found in the mines of Colombia. A trapiche emerald exhibits a "star" pattern. It is named for the trapiche, a grinding wheel used to process sugarcane in the region. Colombian emeralds are generally the most prized.

Golden beryl can range in colors from pale yellow to a brilliant gold. Unlike emerald, golden beryl has very few flaws. The term "golden beryl" is sometimes synonymous with heliodor.

Both golden beryl and heliodor are used as gems.
Morganite, also known as "pink beryl", "rose beryl", "pink emerald", and "cesian (or caesian) beryl", is a rare light pink to rose-colored gem-quality variety of beryl. Orange/yellow varieties of morganite can also be found, and color banding is common.

Pink beryl was first discovered on an island on the coast of Madagascar in 1910. In December 1910, the New York Academy of Sciences named the pink variety of beryl "morganite" after financier J. P. Morgan.
Red beryl (also known as "red emerald") is a red variety of beryl. It was first described in 1904 for an occurrence at Juab County, Utah.

Red beryl is extremely rare and has only been reported from a handful of locations. The greatest concentration of gem-grade red beryl comes from the Violet Claim in the Wah Wah Mountains of mid-western Utah, discovered in 1958. While gem beryls are ordinarily found in pegmatites and certain metamorphic stones, red beryl occurs in topaz-bearing rhyolites. It is formed by crystallizing under low pressure and high temperature from miarolitic cavities of the rhyolite.

Monday, 21 November 2016

Lucara sells 224.5 carat rough diamond for $11.11 million

Lucara Diamond (LUC.t) sold Lot 1001, a 224.5-carat Type IIa diamond, for $11.11-million or $49,497 per carat on November 18th. The stone sold on the one-year anniversary of the recovery of the historic 1,109-carat Lesedi La Rona diamond.
The Lesedi La Rona diamond is the second-largest gem quality diamond ever found, second only to the Cullinan.

Saturday, 19 November 2016

Argyle Pinks


Australia's Argyle Diamond mine is the world's primary source (95%) of rare pink diamonds. Pink diamonds are at very least 20 times the price of an equivalent white diamond. This places them in the rarified air of most highly concentrated form of wealth on Earth.

After being cut and polished at Rio Tinto’s diamond cutting and polishing factory in Perth, exceptional pink diamonds from each year's production are sold individually at 'tenders'.

The diamonds average around a carat each with 40 to 50 carats in total sold each year. Of every million carats of rough diamonds produced at the Argyle mine, less than one carat is suitable for sale in one of the tenders. Prices can range from US $100,000/ct to US$1,000,000/ct and far beyond.



8.41 carat Purple-Pink Diamond. It made $17,778,247 in 2015

In March 2012 a 12.76-carat pink diamond was unearthed at Argyle, the largest ever found. It was christened as the Argyle Pink Jubilee.

The 12.04-carat "The Martian Pink" sold for $17m in May 2012, twice it's pre-sale estimate of $ 8m.

The Argyle Toki is a 1.59ct emerald cut Fancy Intense Purplish Pink diamond

The Argyle Siren, 1.32 ct. square radiant cut Fancy Vivid Purplish Pink, VS2

Laurence Graff set the entire first tender of Argyle pinks in this brooch

The 24.78 carat Graff Pink Diamond and a 5 carat Fancy Vivid Pink