It is suspended from a diamond necklace that incorporates yellow and white stones, made by London designer Laurence Graff.
Pieces containing seven of the nine principal stones cut from the Cullinan Diamond are reunited for the first time.
The exhibition, which is part of this summer's annual opening of Buckingham Palace, includes a host of priceless jewelry, such as the emerald-encrusted Vladimir Tiara and two brooches set with stones from the famous Cullinan Diamond, said to be the largest rough gem-quality diamond ever found, at nearly 3, 107 carats.
The area has the earliest known diamond mines in the world, producing the stones as early as 800BC.
More important, if Namibia is able to establish a viable cutting and polishing industry using its own stones, then why not every other diamond-producing country too?
ECONOMIST: The diamond cartel: The cartel isn't for ever | The
Antwerp is the hub of the world diamond trade - about 150m euros' worth of stones move in and out of the city every day, the spokeswoman added.
Some 34, 000 jobs in the city are connected to the diamond trade, according to the Antwerp World Diamond Centre, from mining company representatives to dealers to the craftsmen who polish the stones.
As well as rings crafted out of diamonds and different gemstones, Mr. Fennell is bringing out an 18-karat-gold bracelet five crowns linked together in different colored stones, consisting of amethyst, citrine, blue topaz, prasiolite and diamond.
Wanting to expand globally and needing a steady supply of diamonds, especially bigger stones, in 1998 he bought a 51% controlling stake in a Johannesburg diamond wholesaler and manufacturer, South African Diamond Corp. (Safdico).
Prosecutors say Taylor gave Campbell a diamond during the war in Sierra Leone, contradicting Taylor's testimony that he never handled the precious stones that fueled the conflict.
The stones were en route from Antwerp, Belgium, to Zurich, Switzerland, a spokesman for the diamond center said, citing police.
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