Diamond sales are very important at auctions.
Solitaire diamonds of old cut, modern cut or diamonds on rings, brooches, bracelets, and necklaces are presented at Aguttes on the occasion of our numerous jewellery auctions and more precisely of our four annual catalogued sales.
The estimate made by the Philippine expert Dupré la Tour allows you to know the minimum value of your diamond. The auction then allows us to put a maximum number of buyers in competition with each other in order to obtain the best possible price for the jewel entrusted to us. Very often we will propose to the purchasers a certificate established by an independent laboratory in order to determine all the characteristics of the diamond. This analysis makes it possible to bring important precisions to reach the best possible price. Last December this one enabled us to identify a diamond of Golconde type of 5,51 carats which we thus sold at 130 000€ ttc.
Until the 17th century, diamonds came from mines located in India, particularly in the Golconde region, a place that was reputed to contain the most beautiful diamonds in the world. According to scientific experts, the diamonds from this region are of impeccable chemical purity and perfect atomic structure. In 1698, the English explorer and governor, Thomas Pitt, took the diamond known as “The Regent” from the La Golconde deposits to Europe. In 1706, cut in the most revealing way of its brilliance for the time, this diamond was considered to be the most perfect of gems, of unequalled purity and fire. Worn by Louis XV, Louis XVI, Charles X, Napoleon I, Napoleon III and many others, this diamond today has an inestimable historical value and is displayed in the Louvre as a work of art. It is very difficult today to find a diamond from La Golconde on the market.
After the exhaustion of the mines in India, Brazil and South Africa became the main suppliers of diamonds. Deposits in the four corners of the world will then emerge: in Australia, Canada and the United States for a use in jewellery more and more important.
At the beginning of the last century, after the polychrome jewellery of the 1920s, high jewellery became interested in monochrome jewellery, it was the era of “white jewellery” in the 1930s. The lapidaries developed new techniques for cutting diamonds, thus the brilliant cut, which gives maximum brilliance, and the baguette cut according to an expensive technique that requires a significant sacrifice of material. These different sizes of diamonds assembled on a platinum setting form jewels with geometrical compositions and abstract patterns revealing the brilliance of the diamond. These jewels of the time, of great technical qualities, often assembled by the greatest French workshops are very much in demand today.
Diamonds are valued today according to specific quality factors known as the 4C.
The color (Color) the most sought-after for a diamond is the “white” in other words the colorless, whose classification is the letter D. As the diamond turns yellow or becomes coloured, it is switched to the following letters.
Clarity indicates the absence or presence of foreign objects called “inclusions” on the surface or inside the gem. A clarity scale places diamonds in different classifications ranging from a pure diamond to a diamond with strong inclusions visible to the naked eye. Internal inclusions are more troublesome than surface inclusions, which can sometimes disappear with polishing.
The cut of a diamond is shaped by a diamond cutter and should reveal the brilliance of the stone. The brilliant cut is the cut that most optimizes the brilliance of a diamond.
The weight (Carat) has an exponential value for the diamond, because the greater the weight, the rarer the gem will be considered rare and therefore more expensive.
The observation of all these criteria allows us to determine the value of a diamond. This is what will be proposed during the first appraisal appointment with our Philippine expert Dupré la Tour.