Diamond Shapes

Thursday, July 9, 2009


Available Diamond Shapes

If you consideration all diamond shapes were the same, you may be surprised at the abundant number of diamond shapes that are available. Most jewelers offer at least nine of the most common gemstone shapes, including:

•Round
•Marquis
•Oval
•Pear
•Heart
•Princess
•Rectangle Princess
•Baguette
•Trillent
•Cushion
•Emerald
•Square Emerald
•Brilliant Princess
•Trapeze
•Radiant
•Asscher
•Old European

Two diamonds that are the same shape will appear to look slightly different depending on the size and weight of the diamond, as well as the type of setting that the stone is placed in. The same ring worn on two different hands can also look quite different, based on the size of the hands.

How to Buy Diamond Engagement Rings

There is much to think when purchasing

A diamond – particularly diamond
Engagement rings! The custom of
Presenting a woman with a diamond
Engagement ring when proposing begin in
1477 when Archduke Maximilian presented
A diamond ring to Mary of Burgundy – and
In most cases, the woman you plan to
Propose to will expect a ring to escort
That proposal!

First, decide how much ring you can
Have enough money. Most peopleuse the two months
Salary’ rules. This means that the ring should
Cost the equal of two months of your
Current salary. Because you have other bills
To pay, saving up this amount of money may
Take quite a bit of time. You should consider
Financing. Simply go to the jeweler of your
Choice and tell them that you plan to purchase an
Engagement ring and that financing will be
Required. Go ahead and get the credit
Check out of the way, find out what your
Payments will be, and how much of a down
Payment is required.

Now, have your mother, sister, or your
Girlfriends best friend take your girlfriend
Shopping, and make sure that they gaze at
The engagement rings to get an idea of what
She might like. Make sure that the jewelry
Store you buy the ring from will allow you to
Return the ring, if that is required, or allow
Your girlfriend to exchange it for another if
She isn’t happy with it!

All about the Clarity of Diamonds

Clarity is a significant feature of a diamond,
And it is important to know how to grade the
Clarity of a diamond before you buys one. It is
Actually quite easy to learn how to grade the
Clarity of a diamond. There are essentially two
Things that you must understand: Diamonds
With visual inclusions and blemishes, and
Those that are ‘eye clean’ meaning that there
Are no inclusions or blemishes that can be
Seen with the naked eye. From there, the
Clarity of a diamond is additional broken down
Into subcategories.

Many people mistakenly think that diamond
Clarity refers to how clear it is. This isn’t so.
Clarity actually refers to the inner and
External imperfections of the diamond. The
Best diamonds, of course get a grade of FL
Or IF – Flawless or Internally Faultless –
Meaning that it is perfect. A grade of I-1, I-2
Or I-3 means that the diamond is imperfect,
With a grade of I-3 being the most horrible.

Other grades are VVS1 and VVS2, which
Means that the diamond is very, very slightly
Imperfect; VS1 and VS2, meaning the
Diamond is very slightly imperfect; SI-1 and
SI-2, which means that the diamond is
Slightly imperfect.

About Diamond Weights

Diamonds are calculated in Carat Weight.
One carat weighs 200 milligrams. If a
Diamond is referred to as four grains, this
Also means that it is a one carat diamond.
The word Carat comes from the word carob.
A carob is a bean that grows on a tree in the
Mediterranean. In times past, if a diamond
Weighed the same as a carob bean, it was
One carob or one carat.

Though, in the Far East, where Carob trees
Do not grow, rice was used to calculate the
Weight of a diamond. If a diamond weighed
As much as four grains of rice, it was four
Grains – or one carat as we know it to be
Now. The majority of diamond purchases
Are for diamonds that are 1/3 of a carat.

Be careful when shopping for diamonds that
Are already set or mounted. If more than one
Diamond is used in the piece, the tag on the
Jewelry will give the CTW or Carat Total
Weight – it does not tell you the carat weight
Of each stone in the piece. You need to ask
The jeweler for the total carat weight of the
Major diamond in the piece to truly
Appreciate what you are buying.

Diamond produce In The Kimberley Process

Wednesday, June 24, 2009

In May 2000, Southern African diamond producing states met in Kimberley, South Africa, to come up with a way to stop the trade in disagreement diamonds and to ensure consumers that the diamonds that they purchase have not contribute to violent difference and human rights abuses in their countries of source.

In December 2000, the United Nations General Assembly adopted a resolution supporting the creation of an international certification scheme for rough diamonds. In November 2002, after near two years of compromise, the efforts of governments, the international diamond industry and NGOs [Non-Government Organizations] culminate in the creation of the Kimberley Process Certification Plan (KPCS). The KPCS outlines the supplies by which the trade in rough diamonds is to be regulated by countries, regional economic integration organizations and rough diamond-trading entity.

The KPCS imposes strict requirements on all Participant to guard against conflict diamonds incoming the lawful trade. Participants are required to implement interior controls, as outline in the KPCS document, and all shipments of rough diamonds must be accompanied by a Kimberley Process certificate. The requirements for participation are outlined in Sections II, V (a) and VI (8,9) of the KPCS. Participants can only trade with other Participants who have met the minimum requirements of the certification system.

While each Participant is required to implement the Kimberley Process in their individual territory, sharing information and insight is an essential part of creation the certification scheme work. Annual Plenary meetings are held to give Participants the opportunity to converse with one another and with industry and civil society members to improve the success of the regulatory regime.

Participants, industry and civil society council work together in Working Groups - Monitoring, Statistics, Diamond Experts - and Committees - Participation Committee and Selection Committee - to ensure that the integrity of the certification scheme is upheld and that the Kimberley Process moves closer to stop the trade in conflict diamonds.

Today the Kimberley Process Certification Scheme has evolved into an effective mechanism for stopping the trade in conflict diamonds. The tireless efforts of governments, industry leaders and civil civilization representatives have help ensure that the horrors caused by conflict diamonds may one day come to an end. But there leftovers much to be done. All involved with the Kimberley Process continue to monitor and assess the effectiveness of the certification scheme and strive towards a world free of conflict diamonds.

The Kimberley Process is a joint government, international diamond industry and civil society plan to stem the flow of conflict diamonds - rough diamonds that are used by rebel actions to finance wars against lawful governments. The trade in these illicit stones has contributed to devastating conflicts in countries such as Angola, Cote d'Ivoire, the Self-governing Republic of Congo and Sierra Leone. The Kimberley Process Certification Scheme is an innovative, voluntary system that imposes wide requirements on Participants to certify that shipments of rough diamonds are free from conflict diamonds. The Kimberley Process is composed of 45 Participants, including the European Community. Kimberley Process Participants account for about 99.8% of the global manufacture of rough diamonds.

Shapes of Diamond

The cut of a diamond refers to the way the stone is shaped and polished, how the facets are arranged and how deep or shallow it’s cut. There are various cuts of diamonds that refer to that, many of them patented. Both Asscher and Princess diamonds are square-shaped diamonds, but they are vastly different in how the facet are cut and arranged.

Cut also refers to the shape of the diamond. The shape is often determined by how the molecules of the crystal are arranged. If it’s an octahedron, it will be cut as a round brilliant, and often two round brilliants can be cut from the same original crystal. Other crystal configurations, such as macer, will be cut as marquise or oval diamonds.

The modern round cut brilliant stone has 58 facets, or 57 if the tiny bottom facet, the culet, is omitted. The Princess cut is unique in that it’s a square diamond with pointed corners. Many diamonds, even square and emerald cut diamonds will have rounded or cut-off corners, because contrary to popular opinion, a diamond can chip or scratch if it knocks against something at the wrong angle. It’s a bad idea to try to scratch a mirror with any diamond!

An emerald shaped diamond is a rectangle cut with longer, flat facets. It’s a good cut for a diamond that’s exceptionally clear. If it’s not, then an emerald cut diamond can appear cloudy.

The Asscher diamond is similar to an emerald shape, except it’s square. It’s cutting resembles a spider web when viewed from above.

Other diamond shapes are self-explanatory. A pear- or tear-shaped diamond is exactly that. It’s an oval that’s wider at one end and curves to a point at the other end. An oval is a perfect oval. The marquise-shaped diamond can maximize the carat weight of a stone because it’s a longer and flatter cut, yet highly faceted. The marquise comes in a variety of length-to-width ratios.

Diamond Structure

Crystal structure: Diamond
Group of symmetry: Oh7-Fd3m
Number of atoms in 1 cm3: 1.764·1023
Debye temperature: 1860 K
Density: 3.515 g/cm3
Dielectric constant (102-104 Hz): 5.7
Effective electron masses ml(at 85 K): 1.40 mo
Effective electron masses mt (at 85 K): 0.36 mo
Effective hole masses mh(at 1.2 K): 2.12 mo
Effective hole masses mlp (at 1.2 K): 0.70 mo
Effective hole masses split-off mso: 1.06 mo
Lattice constant: 3.567A
Optical phonon energy: 0.16 eV

Jayesh K Movaliya | Download this template