Diamonds

Home Diamonds Page 7

Magnificent Diamond Ear Pendants

0

2014-05-30_0736

A magnificent pair of diamond ear pendants sold on May 27, 2014 in Hong Kong at the Christie’s auction for HK$75,160,000 (US$9,738,684)

Each suspending a pear-shaped diamond weighing 25.49 and 25.31 carats, surmounted by a pear-shaped diamond weighing 2.45 and 2.33 carats, spaced by a brilliant-cut diamond weighing 0.73 and 0.65 carat, mounted in 18k white gold, 5.1 cm long

Accompanied by two reports nos. 2155849682 and 2155922825 dated 9 January 2014 and 20 March 2014 from the Gemological Institute of America (GIA) stating that the 25.49 and 25.31 carat diamonds are D colour, internally flawless clarity, with excellent polish and symmetry

Also accompanied by two supplemental letters from the Gemological Institute of America stating that the 25.49 and 25.31 carat diamonds have been determined to be type IIa. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency. Type IIa diamonds were first identified as originating from India (particularly from the Golconda region) but have since been recovered in all major diamond-producing regions of the world. Among famous gem diamonds, the 530.20 carat Cullinan I and the 105.60 carat Koh-i-noor, are examples of Type IIa

Accompanied by four reports dated 20 October 2004 to 3 February 2014 from the Gemological Institute of America with the following details:

Report Weight Color Clarity Cut

13678131 2.45 D Internally Flawless Pear
1132867977 2.33 D Internally Flawless Pear
2127999634 0.73 D Internally Flawless Brilliant
1165821523 0.65 D Internally Flawless Brilliant

Please note that one certificate is more than 3 years old and might require an update (2)

25.49 25.31 克拉梨形D/IF Type IIa鑽石耳墜,配以2.542.330.73
0.65
克拉梨形及圓形D/IF 鑽石,附GIA證書,鑲18k白金,耳墜長度5.1 厘米

Source : http://www.christies.com/

 

 

 

 

 

 

 

Diamond and Graphite

41

In the field of gemological or geological study a basic understanding on fundamentals is important for us to appreciate the subject matter more thoroughly as well as giving us a better perspective on how minerals differ from each other.

There is no intention to delve too deeply into scientific principals and a sure way to lose readership is to come up with jargons like Angstrom, icositetrahedron structure and some fancy high tech unreadable scientific terms which are only required by PhD students doing a thesis.  However, some science is inevitable and a layman’s term is laid out so that readers will have a better understanding.

Diamond and graphite are both polymorph of the native element carbon.  Minerals that represent different arrangement of their internal atoms are called polymorph.  Thus, diamond and graphite have the same chemical composition but different crystal structures.

Diamond crystallizes in the isometric system (or cubic system) while graphite crystallizes in the hexagonal system.  A schematic diagram below would be easier to understand.


Diamond has a framework structure where the carbon atoms are bonded to other carbon atoms in three dimensions as opposed to two in graphite.

Although both are of the native element carbon their properties differs as follows:

  • Diamond is the hardest mineral known to man, Graphite is one of the softest.
  • Diamond is an excellent electrical insulator, Graphite is a good conductor of electricity.
  • Diamond is the ultimate abrasive, Graphite is a very good lubricant.
  • Diamond is usually transparent, Graphite is opaque.

Hence, the diamond stone on your engagement ring is simply Carbon but take heart a diamond with excellent color and clarity is a rare mineral.

The Darya-i-Nur Pink Diamond

0
The Darya-i-Nur Pink Diamond of the Iranian Crown Jewels

The Darya-i-Nur, which means “Ocean of Light” in Persian, is one of the largest and most celebrated diamonds in the world, weighing an estimated 186 carats. Its color, pale pink, is one of the rarest to be found in diamonds. The Darya-i-Nur presently forms part of the Iranian Crown Jewels and is on display at the Central Bank of Iran in Tehran.

This diamond, like the Koh-i-Noor (read here), was mined at the Golconda mines in Andhra Pradesh.  It found its way into the possession of the Mughal Emperors.

In 1739, Nader Shah of Persia invaded Northern India, occupied Delhi and then massacred many of its inhabitants. As payment for returning the crown of India to the Mughal emperor, Muhammad, he took possession of the entire fabled treasury of the Mughals, including the Darya-i-Nur, in addition to the Koh-i-Noor and the Peacock Throne. All of these treasures were carried to Iran by Nader Shah and the Darya-i-Nur has remained there ever since.

The Coronation of The Shah of Iran

Reza Shah, founder of the Pahlavi Dynasty, wore the diamond as a decoration on his military hat during his coronation in 1926, and it was used again by his son Mohammad Reza Shah Pahlavi’s (the last of the Shah of Iran) coronation ceremony in 1967.

The Nur-ul-Ain Pink Diamond Mounted On A Tiara

In 1965, a Canadian team conducting research on the Iranian Crown Jewels concluded that the Darya-i-Nur may well have been part of a large pink diamond that had been studded in the throne of the Mughal Emperor Shah Jahan. This diamond may have been cut into two pieces; the larger part is the Darya-i-Nur, the smaller part is believed to be the 60 carats Nur-ul-Ain diamond, presently studded in a tiara also in Iranian Imperial collection.

http://en.wikipedia.org, http://www.internetstones.com, http://www.nndb.com, http://www.marxist.com

World’s Largest Vivid Yellow Diamond

2

Jerry Hall Holding The 110 ct Vivid Yellow Diamond

The 110-carat vivid yellow Cora Sun-Drop diamond is on loan to the Natural History Museum in London and the museum decided to promote it with a photo shoot with former model Jerry Hall.  The unusual gem, the largest vivid yellow pear-shape diamond, belongs to Cora International.



The Cora Sun-Drop was mined in Africa and polished by Cora International, a company that specializes in very large and fancy color diamonds.

The diamond is on display until August this year.

Ref : http://www.idexonline.com dated March 2, 2011.

Anatomy of a Diamond

2

Anatomy of a Diamond

As I have mentioned in my earlier post on Learning The Fundamentals, it is important to know some basic terms, whether you are a starting novice wanting to learn more about diamonds or you are interested to get into the trade.  Perhaps you are contemplating to buy an engagement ring for your loved one and you are not sure whether the seller is selling what he/she represents to you, short of asking him/her to place his/her hand on a Holy Book and swore that he/she is made of the truth.

Profile of a Diamond

Nowadays there is not dearth of information that is available to us, but more of an information deluge from various medias that one has to filter out the chaff with the wheat. Cut out the white noise so to speak.  So I condense some material to give readers a simpler guide.  This post can serve as a reference material for you, whether you are the uninitiated or the initiated wanting to get more.

Diamond Proportions
Proportions of a Diamond
Perspective of a Diamond
Table Percentage of a Diamond

Trawling the internet, I pluck out some of the easiest graphics for the readers to understand the various terms of the anatomy of a diamond.  References and credit mention are made below this post, so that if you want more then you go deeper.

Principal Parts of a Diamond

Note: Some descriptions are a repeat to reinforce the learning experience.

rokstok.com, nitacreations.com, http://the-perfect-diamond.info, /www.mividazul.com, /www.dvdiamonds.com, /www.rocksmarts.com, diamondradiance.com, www.sydneyrosen.com, www.firenzejewels.com, admin.moguling.com, http://www.sanghavidiamonds.com, http://www.langantiques.com, http://www.furthers.com, http://smith-jewelers.com,

2,044FansLike
7,242FollowersFollow
303FollowersFollow

My Favorites

I Say, Son, This Is Damn Fxxking Good! “ 他妈那个 B…这简直是棒极了!”

I Say, Son, This Is Damn Fxxking Good! 我说 “ 孩儿们,他妈那个 B…这简直是棒极了!” Abstract: Occasionally sharing our own life experiences with our children can be exhilarating and...

Popular Posts