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Petra Diamonds is a leading supplier of rough diamonds. A number of acquisitions have established Petra as one of the world�s largest independent diamond groups by resources, with a total resource base of 262 million carats.
The process of transforming a rough diamond into a polished gemstone is both an art and a science. A well-cut diamond reflects light within itself, from one facet to another, as well as through the top of the diamond, bringing out its spectral brilliance.
The cutting and polishing of a diamond crystal always results in a dramatic loss of weight; rarely is it less than 50%. Sometimes the cutters compromise and accept lesser proportions and symmetry in order to avoid inclusions or to preserve the carat rating.
After a stone has been cut, it is then polished and classified again, this time by its cut, colour, clarity and carat weight, characteristics known as ‘the four Cs’. It is then sold via one of the registered diamond exchanges (also known as; bourses’) located around the world or directly to wholesalers or diamond jewellery manufacturers.
Pink diamonds are known to occur in only a few mines throughout the world, and none of these have ever proved to be a steady commercial source for gem-quality pinks. It is this scarcity, coupled with their beauty, that has made them a highly desirable in the international jewellery market. Celebrities such as Jennifer Lopez, who sported a 6.1 carat pink diamond engagement ring in 2002, have helped to spread their appeal yet further.
The alluvial deposits in southern India produced a limited amount of pinks during the active mining years of the 17th century. The many alluvial deposits throughout Brazil have also been a notable but infrequent source of pinks. Currently the Argyle mine (Rio Tinto) in Australia is the world’s most significant source of pinks, though several Russian and African deposits, including the Williamson mine in Tanzania (owned by Petra Diamonds), are also known sources. Williamson is the source of the famous Williamson Pink, a 54.5 carat rough diamond which was recovered in 1947. It was polished to form a round ‘brilliant’ cut of 23.6 carats, and was presented to the then Princess Elizabeth as the centre piece of a floral brooch for her forthcoming wedding to Prince Phillip. Pinks have also been recovered at Petra�s Koffiefontein mine in South Africa.
The Darya-i-nur-”Sea of Light”, “River of Light” or “Ocean of Light “diamond is the largest pink diamond and one of the largest and oldest diamonds in the world. Weighing 182 carats its colour, pale pink, is one of the rarest to be found in diamonds. The Darya-i-nur presently forms part of the Iranian Crown Jewels.
Reds are undoubtedly the rarest of coloured diamonds. Less than 20 stones have so far ever been certified as a red diamond, most of them weighing less than half a carat. These diamonds are a collector’s item and every year prices reach new records. Prices per carat have so far ranged from about US$800,000 to US$1.9 million which makes red diamonds one of the most concentrated forms of wealth. Furthermore, they have never significantly lost value because supply has never come close to exceeding demand.
Red diamonds have the same properties as pink diamonds; the term ‘red’ refers to a dark or intense pink. Therefore the only colour grade for a red is ‘fancy’ as it falls in the pink category when being any lighter. They have been found in Brazil, South Africa, Borneo, India, Venezuela and Australia.
The most famous of these coloured stones is the Moussaieff Red Diamond. It is the largest red diamond ever to be graded by the GIA. The Moussaieff Red is reported to have been found by a Brazilian farmer in the mid-1990’s as a rough of approximately 13 carats. The diamond was purchased and cut by the William Goldberg Diamond Corp. where it went by its original name the Red Shield. The now 5.11 carat gem is currently owned by Moussaieff Jewellers Ltd.
Common names for red diamonds include blood red, ruby, magenta, raspberry, rose, strawberry, cherry, tomato etc. Red diamond rough is mined in Australia, Brazil and South Africa.
While coloured diamonds have been known and admired for centuries, their phenomenal growth in widespread popularity is a relatively recent phenomenon. In the not so distant past only large historic diamonds such as the Hope blue or the Dresden green commanded much attention, even within the gem and jewellery community. A major turning point came during the late 1970’s when the Argyle mine (Rio Tinto) in Western Australia was discovered, a prolific source of brown (“champagne”) and yellow diamonds, as well as some pinks and greens. New availability of coloured diamonds meant that they became more accessible to the greater public and Australian marketing transformed the previous mindset that colourless diamonds are most desirable.
More attention was brought to these precious stones in 1987 when Christies auctioned the Hancock Red, a 0.95 carat red diamond, in New York. It was sold for $880,000, the record price per carat for any gem ever sold at auction at that time. However currently the record for the most expensive diamond ever sold belongs to a 3.73 carat blue diamond sold at auction to Lawrence Graff in May 2008, at US$1.3 million per carat.
According to Daniel Prince, a bespoke London jeweller, ‘No other jewel combines the rarity, beauty and sex appeal of a coloured diamond’. Coloured diamonds are indeed exceedingly rare. For every 100,000 D-flawless diamonds, there is perhaps one coloured diamond, and it is probably not flawless. The beauty and the rarity of these coloured diamonds have generated unprecedented desire and incomparable prices.
A diamond gets its colour from minute amounts of trace elements, such as nitrogen, boron, graphite and hydrogen, which interact with the carbon atoms that make up the stone, or via exposure to natural radiation. Each element contains its own hues. Nitrogen will result in a yellow or orange stone, which, with additional amounts, becomes deeper in colour. Sub microscopic inclusions, such as graphite, block all transmissions of light, resulting in a black diamond. Boron produces blue and uranium develops green. Hydrogen creates pink, purple and red. According to Fran�ois Curiel, jewellery expert and chairman of Christie’s Europe, “Rarely do imperfections add value. In the case of coloured diamonds, it is ironic that the beauty and rarity of these gems comes from an impurity. While a perfect colourless diamond now trades at $100,000 per carat, the benchmark for the best colour diamonds has surpassed $1 million a carat and continues to rise.”
Colour is the most important factor in determining the value of a gemstone, this being determined by its hue, tone, saturation and distribution. Hue is the term used for the actual colour of the spectrum: red, orange, yellow, green, blue, indigo or violet. The more pure a gemstone’s hue, the more valuable it is. Because gemstones are composed of many naturally occurring elements, they typically emit one dominant colour and one or more underlying colours. Tone represents how light or dark a stone appears depending on how much brown, black, grey or white is present. Saturation describes strength of colour in terms of degrees of intensity- the more colour saturated a gemstone is, the more valuable it becomes. Distribution is how evenly the colour spreads out across the body of the gemstone.
Coloured diamonds are graded by the terms Fancy, Fancy Deep and Fancy Vivid, in ascending order of desirability. Fancy Deep describes stones of medium to dark tone and moderate to strong saturation while Fancy Vivid is a deep colour with no infiltration of other colours. According to Thomas Burstein, “The main concern for collectors is that the diamond shows its colour; it has to be evenly dispersed.”
Each coloured diamond is different not only because of its natural colour but also because it is shaped and finely polished. The cutting of coloured diamonds is significantly important, performed by highly skilled craftsmen who combine their technical knowledge with a deep appreciation for beauty and colour.
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NETDIAMONDS
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South Africa
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Manfred Karner Designer Jewellery
Contact Us
Tel: +27 21 438 5551
Fax: +27 21 438 5550
Email: manfredk@mweb.co.za
Physical Address:
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Victoria Road
Camps Bay
Cape Town
Postal Address:
Shop 14, Promenade Centre
Victoria Road
Camps Bay
Cape Town
South Africa
8005
Manfred Karner Designer Jewellery
This website may not be for everyone, but will appeal to those with a taste for unashamedly well crafted hand made jewellery.
Some of our pieces are expensive, some are affordable and all are made in our Camps Bay workshop, where we welcome you to browse through our pieces and discuss the finer details with us.
We are passionately proud of our work and all the beautiful pieces we create.
A proud 25 year history has produced a superb selection of individually crafted pieces that have clients returning time and time again. We wouldn’t have it any other way.
Our clients always return, as we make jewellery people love to wear!
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NETDIAMONDS
Office hours
Monday to Friday 09h00 – 17h00. We are closed on Saturdays, Sundays and Public Holidays.
Product availability & Pricing
If you are interested in a diamond or piece of jewellery, contact us in order for us to confirm availability of stock. Sometimes with the volume of orders we receive, an item can go out of stock before we are able to post notification on the site. If this happens, we will notify you personally so we can help you find another item or manufacture the specific item for you. We manufacture most of a items on order and manufacturing normally takes two weeks. Infrequently, data may be inaccurately displayed on our site due to system errors. 
While we make every attempt to avoid these errors, they may occur. We reserve the right to correct any and all errors when they do occur and we do not honor inaccurate or erroneous prices. Our prices are also subject to change without notice. We apologize for any inconvenience that this may cause. If you have any questions, please do not hesitate to contact us at info@diamondsource.co.za or 27(0) 11 484 7349/4.
Special orders
We want to help you find the perfect diamond. If you know what you are looking for, contact us and request the exact diamond you want. Please email us at info@diamondsource.co.za
Fancy coloured diamonds
We can not guarantee stock, but we will do our best to source whatever you want.
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View your diamond before it is set
If you prefer, you can view your diamond before it is set. Please do not hesitate to contact us to set up an appointment.
We can also take photos by x 10 magnification and send you a copy of the certificate.
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Payment methods:
For your convenience, we offer the following payment methods:
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Internet Bank transfers: Arrange payment through your bank via the internet.
Telephone banking: Arrange payment through your bank via your telephone.
Cash: We do accept cash.
Credit Cards: Visa, MasterCard and Maestro cards are accepted. We do not accept American Express or Diners.
Deliveries and insurance in South Africa
We offer secure delivery throughout South Africa via courier companies such as RAM and QED. We fully insure each order all the way to you. That means that when your order is in transit to you, it is always risk-free. Quotations will be done separately for each individual order. Transport and delivery costs are normally approx. R350.00 – R550.00 (incl.).
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International shipments
We will ship orders internationally via priority mail, Ram hand-to-hand couriers or Brinks and will quote shipping and insurance charges on each individual order.
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email: admin@diamondrings.co.za
Tel: 011-656-1360
225 Main Street,
Diamond Centre,
Johannesburg,
2001,
South Africa
TEL: +27 71 075 99 77
FAX: +27 86 642 1682
EMAIL: service@netdiamonds.co.za
Tel: 27 11 484 7349
27 11 484 7344
27 72 438 9793
Fax: 27 11 484 7351
Email: info@diamondsource.co.za
Email: sales@diamondsource.co.za
Email: specials@diamondsource.co.za
Postal address:
P.O.Box 786735
Sandton
Johannesburg
South Africa
2146
Physical address:
Suite 408 East Tower
27 Ridge Road
Parktown,
Johannesburg
NOTE:
By appointment only.
(Office hours: Mon. to Fri. 09h00 – 17h00)
Physical Address:
Silver Point Office Park, Block 3,
22 Ealing Crescent, Bryanston, 2021,
Johannesburg, South Africa
Postal Address:
P.O. Box 71007
Bryanston
2021
South Africa
Contact Details:
Telephone: +27 11 702 6900
Fax: +27 11 706 3071
E-mail: info@petradiamonds.com
Diamondrings.co.za
“A diamond ring is an expression of yourself, here you can create that special piece by matching various metals with a perfect diamond. To begin the magic click on the category to the left…”
In a nutshell: we offer high quality diamond rings with multiple design options at outstanding daily prices, all in a secure online environment and supported by diamond guidance and useful jewellery education.
Its that simple.
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