Showing posts with label loose diamonds. Show all posts
Showing posts with label loose diamonds. Show all posts

Sunday, May 16, 2010

Jewels Shine at Auction

source : nytimes.com
"Gems and jewels have been doing brilliantly at auction for months, as if bidders had never been told that there is a recession," Souren Melikian writes.A late 18th-century pair of ear clips with spinels and diamonds, cataloged as "the property of a German Princely and Liechtenstein Ruling Family," almost quadrupled the high estimate at $105,000 at Sotheby's Geneva auction.On Dec. 10, when the mood in London was at an all-time low, Christie's sold the most expensive jewel ever. The 35.56-carat blue diamond rose to $24.31 million, or to be strictly accurate, £16.39 million, to Laurence Graff of London.The gem's history goes back to the 17th century, when Philip IV of Spain gave it to his daughter Margaret Theresa on her betrothal to Leopold I, the ruler of the "Roman Germanic Empire." Later, it belonged to the Princes of Wittelsbach in Bavaria. The stone was cut by Sa'ida-ye Gilani, the Iranian poet, calligrapher and jeweler employed at the Moghul court by the emperor Jahangir (who reigned from 1605-1627), thus multiplying its potential value manyfold. However, the catalog did not mention this, since it was not known at the time of the sale.Five months later, another extraordinary price within its range was realized at Sotheby's in Geneva. A fancy blue diamond, a 7.03-carat gem, brought in $9.48 million, just over $1.34 million a carat, making the diamond the most expensive stone per carat ever sold in any category.Where aristocratic provenance could be established, jewels soared sky-high. A diadem and necklace made by Cartier in 1912 for Olga Princess Paley, Countess of Hohenfelsen, both doubled their high estimates. The diadem (described as an "aigrette tiara") set with rose-cut diamonds and two aquamarines, brought $512,014.The necklace, designed in the same heavily ornate style, cost an equally breathtaking $392,700.
At Christie's late spring London sale of jewelry on June 10, signed jewels set with good quality stones sold like hot cakes regardless of style or period.

A necklace made from oval gold links joined by diamond-set clasps and signed Cartier Paris excited bidders, who sent it climbing to $42,750, more than triple the estimate.
Christie's "superb antique diamond brooch" was an unusual composite piece. Made up from magnificent 18th-century pear-shaped diamond drops hanging from an inverted lotus chalice, it exceeded the high estimate as a private collector from Britain footed the $374,824 bill.
In its own modest line, an Art Deco travel clock of spinach-green jade, its dial framed by a gold chain motif set off by black enamel, provided evidence of the private buyers' sunny disposition, as it brought $14,260, substantially more than the high estimate.

source : nytimes.com

Sunday, May 9, 2010

The bridal category remains solid as a rock

source :nationaljewelernetwork
By Michelle Graff
Nisan 12, 2010

The bridal category remains solid as a rock
Natural blue and pink diamond ring by Scarselli Diamonds, Scarselli.com. Blue was the second hottest natural color diamond choice (behind yellow), with 22 percent of the vote, while 7 percent picked pink.


While consumers may remain hesitant to splurge on fashion jewelry, nothing seems to stop them from falling in love and getting married, the results of National Jeweler's Product Panel on bridal jewelry show.

Nearly half (47 percent) of the retail jewelers who took the survey reported that their loose diamond, diamond engagement ring and wedding band sales have increased over the last three years, while 36 percent said they have remained steady.

As the economy continues to bounce back, bridal will no doubt remain central to any jewelry store's success, as retailers find creative ways to adjust to a post-recession world and continued Internet interference. ...

Wednesday, May 5, 2010

Loose Diamonds - Most Popular Diamond Cuts

round diamond cutRound

For almost 100 years, cutters have been perfecting their art in effort to achieve the grandeur and luster of the round diamond.

asscher diamond cutAsscher

A uniquely modified square Emerald. Being a trademark design cut, Asscher diamonds are short in supply and highly sought-after.

princess diamond cutPrincess

Brilliant, square diamonds with no trimmed corners. An extremely popular choice for engagement rings.

radiant diamond cutRadiant

Rare and unique, the Radiant Diamond features beautiful barely trimmed corners. This blazing cut makes an exceptional choice.

cushion diamond cutCushion

Gently rounded like a cushion, this exceptional cut has been in high demand for over a century as a solitaire.

pear diamond cut

Pear

Pear shaped diamonds go back to the 1400s. These stones are most popular as engagement rings & pendants.

marquise diamond cutMarquise

This slim and point-ended cut, set parallel to the finger & often embellished by accent stones. Popular for wedding rings.

heart diamond cutHeart

The heart shape is mostly in demand in recent years for pendants. High color level is important as it is visible at the corners.

oval diamond cutOval

Elegant and luminous, oval diamonds compliment feminine fingers, and are usually extremely fashionable among small-handed women.

emerald diamond cutEmerald

A rectangular cut of the emerald diamonds featuring trimmed corners and rectangular facets, popular when set with accent stones.

triangle diamond cutTriangle

Also "Trilliant Diamonds", these stones are often used in stud earrings. Chosen wisely, this cut can be a splendid center stone.


source : diamonds-usa.com

Sunday, May 2, 2010

Historic stones rule the day at Christie's

source : nationaljewelernetwork.com
April 23, 2010

Historic stones rule the day at Christie'sLegend has it that the Archduke Maximilian, who once ruled as emperor of Mexico at the urging of Napoleon III, had the Emperor Maximilian Diamond in a pouch around his neck when he was executed by a firing squad. The 39.55-carat cushion-cut stone sold for $1.76 million at Christie's on Thursday.


New York--Two stones with colorful histories sold above their estimates Thursday at Christie's "Jewels: the New York Sale."

According to a news release issued by the auction house, a private U.S. buyer paid $1.76 million for the 39.55-carat, I color Emperor Maximilian Diamond, which was estimated to fetch between $1 million and $1.5 million.

The cushion-cut stone has a long and interesting history, having once been owned by the Archduke Maximilian, who ruled as emperor of Mexico at the insistence of Napoleon III but was later executed. It is believed that he was wearing the diamond around his neck when he faced the firing squad.

After passing through a number of owners, the stone fell into the hands of diamantaire Laurence Graff, who bought it at Christie's in 1982 and sold it to Imelda Marcos, widow of former Philippine President Ferdinand Marcos. ...

Thursday, April 1, 2010

World's most famous 'unseen' diamond

World's most famous 'unseen' diamond
By Jane O'Brien
BBC News, Washington

The room was dimly lit. Armed guards stood at both entrances and enormous ironclad doors were slid shut to seal the gallery.

Nobody spoke above a whisper as we waited for the first glimpse in half a century of one of the world's most extraordinary gems.

The Wittelsbach-Graff Diamond was last seen in public at the 1958 World Exhibition in Brussels. After that, it disappeared and its whereabouts remained a mystery until Laurence Graff, a billionaire diamond dealer, bought it at auction in 2008, appending his surname.

He and his son Francois were in the gallery of the Smithsonian's National Museum of Natural History in Washington DC as the blue stone, was brought up from a secret vault and finally revealed.

Flawless beauty

"I've been privileged over the years to own some of the world's most important and famous diamonds, but I would say that the Wittelsbach-Graff is the most valuable and the most World's most famous 'unseen' diamond - becomes intense orange when viewed under ultraviolet lightbeautiful," he said.

Sitting unadorned on a silken white cloth, it glittered grey and blue in the low light. Classed as "internally flawless" it is said to have exceptional colour and becomes intense orange when viewed under ultraviolet light.

Saturday, October 27, 2007

Diamond : as a mineral

Diamond
diamonds
A scattering of round-brilliant cut diamonds shows off the many reflecting facets.
General
Category Native Minerals
Chemical formula C
Identification
Molecular Weight 12.01 u
Color Typically yellow, brown or gray to colorless. Less often in blue, green, black, translucent white, pink, violet, orange, purple and red.
Crystal habit Octahedral
Crystal system Isometric-Hexoctahedral (Cubic)
Cleavage 111 (perfect in four directions)
Fracture Conchoidal - step like
Mohs Scale hardness 10[1]
Luster Adamantine
Polish luster Adamantine
Refractive index 2.4175–2.4178
Optical Properties Singly Refractive
Birefringence none
Dispersion .044
Pleochroism none
Ultraviolet fluorescence colorless to yellowish stones - inert to strong in long wave, and typically blue. Weaker in short wave.
Absorption spectra In pale yellow stones a 415.5 nm line is typical. Irradiated and annealed diamonds often show a line around 594 nm when cooled to low temperatures.
Streak White
Specific gravity 3.52 (+/- .01)
Density 3.5-3.53
Diaphaneity Transparent to subtransparent to translucent
Diamond is an allotrope of carbon. It is the hardest known natural material and the third-hardest known material after aggregated diamond nanorods and ultrahard fullerite. Its hardness and high dispersion of light make it useful for industrial applications and jewelry.

Diamonds are specifically renowned as a material with superlative physical qualities; they make excellent abrasives because they can be scratched only by other diamonds, Borazon, ultrahard fullerite, or aggregated diamond nanorods, which also means they hold a polish extremely well and retain their lustre. Approximately 130 million carats (26,000 kg) are mined annually, with a total value of nearly USD $9 billion, and about 100,000 kg are synthesized annually.[2]

The name diamond derives from the ancient Greek adamas (αδάμας; “invincible”). They have been treasured as gemstones since their use as religious icons in ancient India and usage in engraving tools also dates to early human history.[3][4] Popularity of diamonds has risen since the 19th century because of increased supply, improved cutting and polishing techniques, growth in the world economy, and innovative and successful advertising campaigns. They are commonly judged by the “four Cs”: carat, clarity, color, and cut.

Roughly 49% of diamonds originate from central and southern Africa, although significant sources of the mineral have been discovered in Canada, India, Russia, Brazil, and Australia. They are mined from kimberlite and lamproite volcanic pipes, which brought to the surface the diamond crystals from deep in the Earth where the high pressure and temperature enables the formation of the crystals. The mining and distribution of natural diamonds are subjects of frequent controversy such as with concerns over the sale of conflict diamonds (aka blood diamonds) by African paramilitary groups.

references :
1.^ a b c d e f g h i j k Gemological Institute of America, GIA Gem Reference Guide 1995, ISBN 0-87311-019-6
2.
Yarnell, Amanda (2004). "The Many Facets of Man-Made Diamonds". Chemical and Engineering News 82 (5): 26–31. American Chemical Society. ISSN 0009-2347. Retrieved on 2006-10-03
3.Pliny the Elder. Natural History: A Selection. Penguin Classics, p. 371. ISBN 0140444130
4."Chinese made first use of diamond", BBC News, 17 May 2005. Retrieved on 2007-03-21
5.Wikipedia,the free encyclodepia