Interested in knowing more about Rough Diamond?

Interested in knowing more about Rough Diamonds?

Corlia Roberts diamond education college offer courses in rough, cutting and polishing and diamond grading, they are situated at Unit G6, No. 3 Sturdee Avenue, Rosebank South Africa, for more information visit http;//

Corlia can be contacted on +27829657740


Composed of carbon, is the hardest natural substance in the world. Each carbon atom is surrounded by four neighboring carbon atoms in a tetrahedral coordination that is the result of a covalent bond and a face-centered arrangement in the cubic unit cell.

Diamond is in the isometric crystal system, which is reflected in the commonly found octahedral or cubic crystal form.

The external crystal class is 4/mBar32/m, while the space group designation is F41dBar32/m. Twins are common on the {111} plane. It has perfect four directional cleavage, adamantine luster, and both a high refractive index, 2.42, and specific gravity, 3.52. Color is usually pale yellow to colorless, but can also be brown, blue, green, orange, red, and black.

Diamond may be up to 3 billion years old, which is much older than their surface host rock (Harlow, 1998, p. 60). Diamond crystallization originates some 200 kilometers, or 320 miles, beneath the surface and the disaggregated crystals are merely transported to the surface via kimberlite and lamproite pipes (Harlow, 1998, p. 54). These igneous host rock formations are roughly cylindrical in shape and act as a conduit from the Earth’s mantle to the contintental crust.

Differentiated between various types, Ia, Ib, IIa, and IIb. Although this information is important to the cutter, it is of no value to the student merely interested in diamond as a gemstone. Diamond’s superior optical properties and hardness has earned this mineral the highest respect in both industry and jewelry. It has a long tradition of invincibility and hence the Greek name, adamas.

Alrosa sells large diamonds for USD 14.8 million at the auction in Vladivostok


ALROSA sells large diamonds for USD 14.8 million at the auction in Vladivostok

ALROSA has summed up the results of the international auction for the sale of special size large diamonds (weighing over 10.8 carats) held in Vladivostok from April 16 to April 27.

The United Selling Organization (USO) of Alrosa sold 101 special size rough diamonds with the total weight of 1751.1 carats. Total sales revenue amounted to USD 14.8 million.

“We invited to our Vladivostok auction 86 companies from the main world’s diamond trading hubs, including Hong Kong, Belgium, Israel, India. 33 companies were recognized as winners in different auction positions.

The auction has completed with a very good results, confirming high demand for this category of rough diamonds”, told Evgeny Agureev, the Member of the Executive committee, Director of the USO ALROSA.
The United Selling Organization of ALROSA and ALROSA branch in Vladivostok organized this auction.


The United Selling Organization ALROSA is in charge of sorting, preliminary valuation, pre-sale preparation and sales of all ALROSA’s rough diamonds.

ALROSA branch in Vladivostok was established in 2016 by the decision of the Company’s Supervisory Board with the purpose of development of the Eurasian Diamond Centre in the territory of the Free Port of Vladivostok. The branch sold the first rough diamonds at the EDC in August-September of 2016.

Premier Diamond Jewelry Show Las Vegas

Premier diamonds

Premier Diamond Jewelry Show Las Vegas

Premier, which will feature jewelry manufacturers and brands, emerging designers, and timepieces, will be located at the Las Vegas Convention Center, alongside the Las Vegas Antique Jewelry and Watch Show, and the AGTA GemFair Las Vegas.

The show is scheduled to run from May 31 to June 4, overlapping with JCK Las Vegas.

The Las Vegas Antique Jewelry & Watch Show is the largest trade only event serving the antique and estate jewelry and watch industry.

Nearly 400 exhibitors grace our show floor to display only the finest merchandise obtained from estates and jewelers across the globe.

Elegant signed pieces from famous names including Cartier, Tiffany’s, David Webb, Harry Winston, Patek Philippe, Van Cleef & Arpels, Evan Roberts and many others permeate the show floor. In addition, all categories of jewelry such as cameos, tennis bracelets, rings, decorative necklaces, brooches, gemstones and pendants will be available.

These stunning collections represent all eras of jewelry history from the Renaissance to Art Deco eras. Embrace the beauty of history.

In Las Vegas, Antique Jewelry & Watches are Put on Display

The Las Vegas Antique Jewelry & Watch Show hosts dealers from more than 25 countries at the Paris Hotel and Casino each summer season.

The four-day show features the largest selection of antique jewelry and watches, including the latest runway trends as well as an array of merchandise from the Renaissance to Modern periods.

U.S. Antique Shows, producer of the industry’s most anticipated events, hosts the Las Vegas show each year.

The show is open to members of the jewelry trade only. Over the last year, we have made some notable improvements to the show including reconfiguring the floor plan to allow dealers an increase in booth size to showcase more of their merchandise.

The Las Vegas Antique Jewelry & Watch Show takes place during Jewelry Week and runs concurrently with COUTURE and JCK Las Vegas.

We serve the unique needs of the antique and antique jewelry marketplace with shows in Las Vegas, Los Angeles, Miami, Miami Beach and New York.

The group’s events offer a broad range of antiques as well as antique, vintage and estate jewelry and watches, and annually draws more than 50,000 consumers and 3,000 dealers from 28 countries worldwide.

De Beers eyes prospects in Zimbabwe, Congo

De Beers eyes prospects in Zimbabwe, Congo

De Beers would be interested in exploring for diamonds in Zimbabwe across the border from its $2 billion Venetia mine if it can get the necessary approvals, Phillip Barton, chief executive of the gem-producer’s South African unit, said in an interview. “Why would it be just on the one side?”

The company would also consider resuming exploration in Congo, if the political situation improves. “If the situation is right in a number of criteria, then we would go back,” Barton said.

© 2018 Bloomberg – Day 2 at the Mining Indaba 2018

Mining Indaba 2018


Address Mining Indaba 

The world’s largest gathering of the most influential stakeholders in African mining. Join a powerful international group of industry professionals that make Cape Town, South Africa their preferred destination to conduct important business and make the vital relationships to sustain their investment interests.

Thousands of delegates come from:


  • Global mining and exploration companies
  • International investors
  • African and non-African governments
  • Investment banks
  • Mining equipment companies
  • Mining services providers
  • Law firms
  • Financial services firms
  • Engineering and research services
  • Tax & accounting companies
  • Business/technical consultants.

Diamond trading lingo

Diamond trading lingo:

Mazal u’bracha

A ‘mazal u’bracha’, which means ‘luck and blessing’ is a traditional Jewish expression used at the conclusion of an agreement of buying and selling of diamonds. Usually, the expression is accompanied by a handshake. It is a way in which the seller wishes the buyer good luck and it further preserves a sense of continuity and commitment to the business ethics.

The term “Mazal” is used across the international diamond trading community to indicate the completion of a deal and agreement on price. The breaking of a “Mazal” is seen as extremely serious as it is construed as a breakdown of trust, the bedrock of the diamond industry.

Memo (Appro)

The term Appro refers to a process whereby a client is permitted to take goods to his or her offices/premises for further inspection. Some diamond trading centres allow this process on the basis of trust. Others go to the extent of issuing a receipt or commission slip.



Holding in the diamond industry applies when a client has inspected the goods but has not yet made a decision to purchase. The goods are kept under seal at the trading premises and cannot be shown to any other client.

Broker’s Note

A Broker’s Note is a statutory document which indicates the passing of ownership from one party to the other. Failure to produce a valid Broker’s Note, when transporting rough diamonds, can result in a penalty being imposed by the SADPMR

The Rough Diamond Course

Recommended diamond education. We are the only recommended Diamond school for rough diamond courses, learn the profession of Diamond Cutting and Rough Diamond Grading in all its phases. We provide services in cutting and polishing rough diamonds, grading and value determination of rough diamonds, Gia and Egl comparison

The Rough Diamond Course:

The Rough Diamond Course brings learning to life for those who what to learn to buy sell and sort rough diamond.

As years of knowledge are presented, the rough diamond course describes how to buy, sell and tender on rough diamond operations.

Through practice modules and exercises, the student develops skills along with knowledge.

The Rough Diamond Course presents a complete discussion of the subject of diamonds in 10 day lessons divided into three general sections.

The first part of the course provides the essential information diamond  dealers need to be professional and honest in their diamond career.

We cover  the 4 C’s of color, clarity, cutting and carat weight, diamond treatments, synthetic diamonds and facts about diamond jewelry.

Important background information like where diamonds come from, how they’re mined and processed, how they’re cut and how they come to market.

The course teaches the  skills related to rough diamonds – how to sort, identification of fakes, marking the diamond, pricing, the selling process, sourcing diamonds from Angola, Botswana, DRC and South Africa.


Practical Training in Diamond and Diamond Grading

Recommended diamond education. We are the only recommended Diamond school for rough diamond courses, learn the profession of Diamond Cutting and Rough Diamond Grading in all its phases. We provide services in cutting and polishing rough diamonds, grading and value determination of rough diamonds, Gia and Egl comparison

Practical Training in Diamond and Diamond Grading,Learn about  exploration and valuation of rough diamonds.

Latest practical training references related to diamond exploration and evaluation.

Acquire up to date state of the art knowledge covering all aspects of diamond valuation and marketing and an excellent grasp of the source of rough diamonds.

You can enquire about our practical training courses by following the link. Simply select the course you’d like to attend, fill in your details and click submit. A member of our Education Department will contact you about your enquiry.

Diamond Prices Steady

diamond prices

Diamond Prices Steady in December

Jan 2, 2018 5:00 AM   By Rapaport

RAPAPORT PRESS RELEASE, January 2, 2018, New York… Polished diamond prices stabilized in December following a better-than-expected holiday season. US consumer sentiment was boosted by economic growth, record-high stock markets and a drastic tax overhaul that is expected to raise disposable income and discretionary spending.

The RapNet Diamond Index (RAPI™) for 1-carat diamonds edged up 0.3% in December. RAPI for 0.30-carat diamonds rose 1.2%, while RAPI for 0.50-carat stones increased 0.6%. RAPI for 3-carat diamonds slid 1.7%.

The 1-carat RAPI softened 0.8% in the fourth quarter and fell 5.3% for the full year. The index declined for the sixth consecutive year in 2017, as noted in the Rapaport Diamond Price Statistics Annual Report to be published in the January 2018 edition of Rapaport Magazine.

Market sentiment improved in December amid steady US holiday jewelry sales and consistent Chinese demand ahead of the Chinese New Year on February 16.

The US retail environment is undergoing unprecedented change, with strong online sales creating greater competition and price uncertainty due to internet discounting. Jewelers and diamantaires who provided added-value services and implemented strategies to engage with customers online and in-store had a successful holiday. In mainland China, more consistent local sales are replacing volatile Chinese tourist shopping elsewhere, with diamond engagement rings gaining popularity among Chinese millennials.

Diamond trading slowed in December, with US and Belgian dealers on vacation during the Christmas-to-New Year break. Dealers are encouraged by reports of positive retail sales, but are waiting for memo returns before assessing the holiday season.

Manufacturers are maintaining steady polished production in anticipation of a rise in first-quarter demand; a period when jewelers typically replenish stock sold during the holiday season.

Dealers start 2018 with a better outlook than in previous years. Booming stock markets, higher wages and lower taxes will result in a sustainable rise in wealth. That will lead to more diamond demand, even as growth in online sales, rising synthetics supply and changing consumer habits contribute to uncertainty.

Rapaport Media Contacts:
U.S.: Sherri Hendricks +1-702-893-9400
International: Avital Engelberg +1-718-521-4976
Mumbai: Prashant Bhojani +91-97694-66855

About the Rapaport RapNet Diamond Index (RAPI™): The RAPI is the average asking price in hundred $/ct. of the 10% best-priced diamonds, for each of the top 25 quality round diamonds (D-H, IF-VS2, GIA-graded, RapSpec-A3 and better) offered for sale on RapNet – Rapaport Diamond Trading Network. has daily listings of approximately 1.2 million diamonds valued at approximately $7.1 billion. Additional information is available at

About the Rapaport Group: The Rapaport Group is an international network of companies providing added-value services that support the development of ethical, transparent, competitive and efficient diamond and jewelry markets. Established in 1976, the Group has more than 20,000 clients in over 121 countries. Group activities include Rapaport Information Services, providing the Rapaport benchmark Price List for diamonds, as well as research, analysis and news; RapNet – the world’s largest diamond trading network, with over 15,000 members in 94 countries and daily listings of approximately 1.2 million diamonds valued at approximately $7.1 billion; Rapaport Laboratory Services, providing GIA and Rapaport gemological services in India, Israel and Belgium; and Rapaport Trading and Auction Services, the world’s largest recycler of diamonds, selling over 500,000 carats of diamonds a year. Additional information is available at

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