About us

The Plantagenet Group is a loose commercial alliance which has been existing for over 100 years.

It has handled discretionary funds amounting to many billions of U.S. Dollars. This alliance consists of a number of sundry Financial Institutions including large Banks and substantial and well known international Family Trusts.

Further information may be obtained from internationally recognized financial agencies.


One of its key investments is the purchase and stockpiling of rough diamonds.

These purchases are made based on Discount Lists against the actual Rapaport Price. All purchases are made under condition of utmost confidentiality with the further condition that product must be proved first. Zurich is the preferred venue for these transactions but other venues will be considered if satisfactory safe-guards can be guaranteed.

Various methods of payment can be considered, but no cash transfer will be made until the goods in question are safely and securely received in the agreed destination.

Scope of Search

Rough stones should be 3 cts and above in size, white or near white in colour and of gem quality. (Up to 20 % smaller stones within a parcel we accept all the time. No industrial qualities, no collector stones.)

And we guarantee further the Group is ready willing and able to buy with no upper limits subject to

  1. these offers are priced at the Rapaport Price and Discount Lists co-ordinates, 45%off rough : cut factor 1:3 and
  2. transactions will be in Zurich, FTZ Malca Amit and/or as agreed and
  3. valuations will be done by our trained Valuers.

Payments will take place after Valuations and Agreements in Price due to your requirements. Prior all initial trenches we require a manifest incl. your price indication. After satisfactory we invite you to Zurich and/or as agreed.

Not any payment in advance!



Q. Robert Dean – Senior Executive – Chief Mandate

Robert is a former Director of a Sheffield Steel Plant holding best contacts to the Steel and Energy Products area of business.

He was educated at Glasgow University. He is a member of the Institute of Chartered Accountants of Scotland as well as internationally recognized Scottish Clubs holding worldwide confidential contacts in various businesses and his best advice is still being requested internationally in his former field.


R. Edgar M. Glocker – Senior Executive – Chief Officer Agent and Broker Department

Edgar is the former Director of a co-operative Namibian coloured Gem Exporter holding the best international contacts in the Gem business incl. to European Cutters.

He was educated at TU Munich. He is Member of a number of cooperations in various subjects and empowered to place agreed business to and/or through these contacts under the utmost confidentiality.

The Agent and Broker Department is an Organization for itself outside the Plantagenet Group and forwards - equivalent to the traditional suppliers to the Group.

In Brokerage the Department is the first Intermediaries Group and processor of information covering our recognized intermediaries.


The late William J. Shearman – Former Chief Executive – Chief Banking and Financial Officer

In 1967, William Shearman, who died on 17.June 2005 of cancer aged 67, was confronted by the plight of homeless people in the East End of London. He thought that the existence of homelessness in a rich western country was an »obscenity«. The result was that he founded the charity, Crisis.

He was a reforming Conservative and humanist who founded the homeless charity »Crisis«.

Recognized Agents in and for Africa


John M. Riggs

PO BOX 958, SEAPOINT, 8051 Cape Town, SA

+27 (0) 78 004 2200

English speaking so as Afrikaans


Kaeno Jejamaije Mujoro

3218 Martin Neib Street, Okahandja-NAMIBIA

+264 81 7484460

English speaking so as Afrikaans and various African Local languages


Andrae Fuchs

Spenglerstraße 2, 4072 Alkoven, Austria

+43 664 1358469

German, English speaking

Feel free to contact any of our recognized Agents – who each is running a successful business her- and/or himself – to discuss any deal you and/or the Plantagenet Group might be interested in.

All discussions will be held under utmost confidentiality, attended and concluded by a Senior Executive.

Evaluation of Rough Diamonds begins with sorting!

The very first is to separate the rough diamonds from the waste material, so as to wash and to clean.

From there they are ready to be sorted into three different varieties:

Bort – opaque stones, the lowest quality of diamonds are crushed to produce the dust used for polishing cut diamonds

Industrial – unsuitable gem diamonds, valued for their hardness and thermal conductivity. Industrial diamonds are still good quality.

Yellow is the preferred colour as yellow stones tend to be harder. They are used for drill bits and other cutting and grinding tools.

Cuttables – gem quality diamonds destined for the Jewellery industry, are then sorted into three further categories:

The common basis in the trade is:

All Things Being Relative!

Remember, you should only pay for a rough stone, a price which is relative to the value of the polished stone (or stones) which can be recovered from it.

For evaluating a piece of rough to market price, it should be set out in a table format (for example – Excel) according to the approximate lower colour, clarity and stone shape!

Start by testing that the stone is really a diamond.

Mohs scale does not lie! So scratch your stone with a diamond pin. (Being used to mark glass by scratching in Laboratories) Diamonds will not show scratches so if any scratches appear, you will know it is something different.

Remember where there is value there can be falsifications too.

The evaluation procedure is as follows:

Sizes are divided into five further subcategories.

  1. Decide on shape of the rough diamond

    Sawable One represents a nicely bordered octahedron or a dodecahedron that can easily be sawn and will yield two polished stones, which will give a recovery weight of min. 50% + even “x”

    Sawable Two is a slightly irregular octahedron (sharp edged!) or a dodecahedron (long!), or a glassy octahedron, or a normal shaped octahedron with a gletz/spot near to side which can normally be polished out, and will yield two polished stones, which will give a recovery weight of min. 45% + even “x”

    Makeable One represents an irregular octa-/dodecahedron (slightly flattened shaped stone) that has formed a natural table (two or three point), or a broken octa-/dodecahedron (topped/four point) that will yield one polished stone with a recovery weight of min.33% + even “x”.

    Makeable Two represents a cleavage (broken piece) or a longish stone of less determinable shape that will yield one polished stone with a recovery weight of min. 30% + even “x”.

    Flats represent macles (a flattish triangular stone with a twinning seam around the edge), chips (broken pieces) and flat stones which have sufficient depth to yield one polished stone with a recovery weight of 20% + even “x”

    So you may speculate already on the recovering size of the polished stone (or stones) which can be recovered from it not regarding specific individual internal qualifications.

  2. Decide on the fluorescence of the rough diamond

    Faint, medium, strong very strong into the blue or into the yellow.

  3. Decide on the colour of the rough diamond

    Put the rough stone against a flat white background and compare the white of the background against the white you see through the rough diamond. A colourless diamond will still be white against the flat white background.

    Exceptional white is absolute colourless which covers the GIA determination in the polished stones D, E, F

    Rare white is colourless which covers the GIA determination in the polished stones G, H

    Slightly tinted white is a small hue to the yellow which covers the GIA determination in the polished stones I,J,K

    Tinted white is a hue to the yellow which covers the GIA determination in the polished stones L, M.

  4. Decide on the purity of the rough diamond

    This is to find relevant inclusions: e.g. crystalline inclusions, carbon inclusions, pinpoints, clouds, fractures, cleavages (feathers, bearding, fissures), some kinds of structure phenomena, poor transparency of the diamond.

    Use a tweezer with 4-5 fingers to pick the rough stone and put it on a milk glass pane give poor light from the bottom up and inspect with a magnifier by twisting the stone.

    If you cannot determine anything because you cannot see into the diamond because of frosty surface or very poor transparency, do not buy! (Beside it’s not more than 1% of the parcel which does not affect any significant changes in price.)

  5. Weigh the rough diamond so as to measure its diameter.

    Please consider the factor: e.g. a 1.0 carat polished stone is in ideal cut range of a girdle-diameter at 6.5mm. Such 6.5mm for the polished are requiring a bit more space in the rough.

    Carat is weight but cut dimensions are in Millimeter, Diameter as Depth over all.

By above discussed characteristics you may calculate already the price of the rough stone (stones) in your hands.

Look up the price in the Rapaport Price List for a polished stone you have determined. Please recognize the small frames within the blocks, e.g. polished colours D,E,F within 1 frame so as G,H so as I,J,K , equivalent in the clarities and evaluate on the poorest co-ordinates within such frames.

Generally, each stone is evaluated separately but if you have several stones with the same characteristics in the same weight range, you can evaluate them as a group.

After you have looked up the price for your determined polished stone in the Rapaport Price List, you know the relative price to your rough stone. Relative - for there is not simply a Price List existing there is a Discount List too. That is the Market Price for your polished stone is varying within a range of up to 45% Discount (sometimes even more, depending on the ultimate consumers’ demand), so as you need to calculate further - there is a basic rule in the trade, which you please keep in mind:

The price of the rough diamond must not exceed (significantly) the 1/3 part of the polished stone’s price (or stones) which can be recovered of it.

That is: You deduct up to 45% of the figure in the Rapaport Price List (prices are in Hundreds of US$/ct) and divide it by 3 so you get a reasonable price of the rough diamond in your hands. If you need the price per carat you need to divide once more by the stone’s weight in carat.

If you do not have the Rapaport Lists look up prices asked on relative polished stones in the internet at international sellers of polished stones, e.g. 77diamonds, London. Remember to deduct inclusive services such as VAT in such prices.

Evaluation starts with sorting, that’s the key to get accurate prices in the rough!

Our requirements to your offer

We welcome your Manifest made out on an Excel Spreadsheet, as follows

Pos Carat range shape colour $/ct ct pos price pos

which we check and after satisfactory we will invite you. Please do not forget to add a photo of that you intend to deliver showing in daylight stones incl. a ruler.

Please consider we require for a first delivery, not more than 500 – 1,000 ct and prefer such stones in the range being representative for your source.



for the benefit of our Agents and Intermediaries

Q. Robert Dean

+44 141 339 9074

Sketch at Institute of Chartered Accountants Scotland (ICAS) reception


R. Edgar M. Glocker

+49 7962 712 5332


Deutschsprachige Anliegen bitte ausschließlich an REM Glocker!


Liable for contents

R. Edgar M. Glocker

Lange Straße 20
74579 Fichtenau

+49 7962 712 5332
+49 321 2126 7635