The Terestchenko Diamond
To gem historians, judging by the reaction of the press, and to the general public as well, it is always something of an event when the existence of an unusual stone, up till now known only to a handful of people, becomes more widely known. That is what occurred in 1984 when Christie's announced that they would be auctioning this fancy blue pear-shaped diamond weighing 42.92 metric carats, the fourth largest recorded blue diamond (The stone might actually be the 5th or 6th largest blue diamond as of the present -- it is true, however, that in 1984 it was indeed the 4th largest, a title which it held for about a decade or so). The Hope Diamond was 42.52 metric carats and the Copenhagen Blue was 45.85 metric carats. An unamed stone reportedly had 51.84 metric carats. The original owners of the gem were the Terestchenko family and specifically attributed to Mihail Ivanovitch Terestchenko. They were sugar-kings in pre-communist Russia. One member, Mikhail or Michael (1886-1956), was the son of Ivan, nephew of Theodore and grandson of Nicola Terestchenko. Michael held advanced political views and became Kerensky's Minister of Foreign Affairs in 1917. Four years before, Mikhail had deposited the diamond with Cartier in Paris. In 1915, he instructed Cartier to remount the gem as the centerpiece in a necklace containing a variety of fancy colored diamonds. The jewel was unique in combining forty-six marquise, round, pear and heart-shaped diamonds ranging from 0.13 to 2.88 carats. Their colors were described as "jonquil, lemon, aquamarine, sultana-green, golden button, grey, blue, crevet, lilac, rose, old port, madeira and topaz." As such, the necklace ranked among the most important creations of this century in fancy colored diamonds. It returned to Russia in 1915 or early 1916.
In 1916, on the eve of the Russian Revolution, the Terestchenko Diamond was secretly taken out of Russia and then passed into private ownership. Its whereabouts until it reappeared in 1984 remain undocumented. The most intriguing—but unproven—story connects the diamond with the French dancer Suzanne Marie Blanche Thuillier, known professionally as Mademoiselle Primrose. Contemporary newspapers reported that she arrived in Nice in 1916 carrying a blue diamond of approximately 43 carats in a concealed pocket of her coat and subsequently pawned it repeatedly. The stone was involved in litigation in Nice during 1924–1925. Gem-A stresses that these reports are contradictory and cannot yet be proven to concern the Tereshchenko Diamond. Within family circles, a more plausible explanation had it as being given to Leon Trotsky by Elizabeth Saranchov in exchange for the release of her son Michael (imprisoned by Lenin for his role in the Kerensky Government) and several other family members. Lenin had intended to execute all the Kerensky government officials but somehow Michael was able to get released and allowed safe passage to the North Sea by orders of Leon Trotsky where he borded a ferry to Sweden.
Like other fancy blues, the Terestchenko belongs to the rare group of Type IIb diamonds. It is not known where it was found: theoretically, it may have come from either the Kollur alluvial deposits in India's Golkonda region or from the Premier Mine in South Africa. However, by 1913 the Premier Mine had been in existence for barely ten years and since there is no report of it having yielded such a rare and unusual gem, it must be assumed that the diamond is of Indian origin.
Days before the sale in Geneva, four dealers contacted Christie's separately, offering to buy the diamond directly at the estimated price, between three and four million Swiss francs, thus saving at least the 10% charge added to the selling price. Christie's refused the offers. In addition, a group of diamond dealers suggested that the auctioneers ought to have the diamond graded by the Gemological Institute of America. They pointed out that while the report of the Swiss laboratory in Lucerne mentioned in the sale catalog was impeccable, it would make commercial sense to have the diamond graded by the GIA because its certificate was better known, particularly in Asia and the Middle East. A sale would thus be made easier in those regions. Christie's duly obliged: the diamond was flown to the GIA laboratory in New York and was returned with the necessary documents.
The Terestchenko came up for sale on November 14th, 1984. At 10pm excitement ran high in the brightly lit ballroom of the Hotel Richmond in Geneva when the Chairman of Christie's announced: "We are now selling Lot 454. We shall start the bidding at three million Swiss francs." The price didn't seem to surprise anyone in the room, which was full of important dealers from all over the world and several billionaires, too. It took 40 seconds for the bidding to reach 6.5 million Swiss francs, a figure far in excess of Christie's most optimistic estimate. Ultimately the auctioneer brought down his hammer when a shout of "Ten million Swiss francs" came from the back of the room. Robert Mouawad, Saudi diamond dealer, had added a new stone to his growing collection for $4,508,196. Since then it has been known as the "Mouawad Blue Diamond".
Commissioned Blue Topaz after the Tereshchenko Diamond
In 2018, Nicholas Mouravieff-Apostol-Korobyine commissioned a replica to be made for his family collection. It consisted of a Pear-shaped natural blue topaz, 53 carats, commissioned as a visual surrogate reproducing the color, pear-shaped form and approximate monumental scale of the celebrated 42.92-carat Tereshchenko Blue Diamond, now known as the Mouawad Blue.
This certified natural blue topaz is:
Sources: Famous Diamonds by Ian Balfour and The Fancy Colored Diamond Index.