So what happened at Christie's New York sale last night? The top lot a 10,09 carat pink with an estimate of $12-15 million failed to sell though the other coloured and white diamonds as well as vintage jewels sold well. All prices include buyer's premium. ALL PRICES INCLUDE BUYER'S PREMIUM Though bidding looked high from the start with Tiffany pieces such as Lot 51 achieving almost nine times top estimates the star of the show failed to sell. The sale on 12 April 2011 totaled $31,792,875/£19,516,804/ €21,971,579 and was 80% sold by lot, 71% by value. See all results here. Rahul Kadakia, Head of Jewelry for Christie's Americas, commented: "While we were disappointed that the 10-carat purple-pink diamond did not find a buyer, top-quality white, blue, pink and yellow diamonds fared very well, with a strong price of US$3.67 million, or $1.1 million per carat achieved for a Fancy Vivid blue diamond. In all, five jewels exceeded the US$1 million mark, with heavy competition among both trade buyers and private collectors for colorless diamonds, large gemstones, and signed jewels." Lot 294 (est $12,000,000-$15,000,000), that failed to sell, is a 10.09 carat fancy vivid purple-pink diamond ring. It's a modified cushion-cut and this is a fabulous stone with a purple hue included in the pink body making it a very attractive color. It is also a type IIa diamond. With this stone not selling, nothing has yet knocked off its perch, the diamond bought by Lawrence Graff, in November 2010, as the most expensive diamond price per carat or the most expensive jewel sold at auction. 'The Graff Pink' is 24.78 carats fancy intense pink and was sold for over $46,000,000 just under two million dollars per carat ( read more here). The top lot was a rectangular-cut D-color, internally flawless diamond of 37.16 carats, which sold for $4,450,500/£2,732,044/€3,075,674 to a private collector. The white diamond ring had a pre-sale estimate of  $4,200,000-$4,800,000 and is a white diamond type IIa stone.  If a diamond is type IIa it means that the stone is the most chemically pure type of diamond and does not have nitrogen in it. These stones are very rare. Among famous white diamonds of type IIa is the Cullinan. It is also called The Star of Africa and is 530.20carats and can be found in the Royal Sector of The Crown Jewels. Lot 292 (est $2,000,000-$3,000,000) sold for $3,666,500/£2,250,767/€2,533,863 is a superb  fancy vivid blue internally flawless diamond ring. The diamond weighs approximately 3.25 carats so acheived $1.1 million per carat. It is an incredibly beautiful color. In blue diamonds there is always a touch of grey. No other natural blue gemstone could be a blue diamond, its color is totally unique. The ring is mounted in platinum and flanked on either side with a half moon diamond. But in a ring such as this, it is the stone which fetches the money rather than the smaller diamonds and the mount.  This sale is not just about the highly valuable coloured diamonds and our expert viewed the jewellery sold at Christie's auction in New York on the 12th April and here is the verdict and the results: The following lots (49, 50 and 51) are a collection of three necklaces by Louis Comfort Tiffany, Tiffany & Co. Although all different in design and materials, these all reflect the delicate manufacture that was typical of the period of the early 20th Century. Lot 49 (est $10,000-$15,000) SOLD FOR $40,000 is a neckchain of oval cabochon moonstones with sapphires and a beautiful openwork sapphire and moonstone pendant.  Lot 50 is made of lapiz lazuli, gold and platinum (est $12,000-$18,000) SOLD FOR $47,500 and Lot 51 is a white and green glass mistletoe blossom suspended on a gold chain (est $15,000-$20,000).SOLD FOR $182,500Lot 53 (est $12,000- $18,000)  is a brooch consisting of a cluster of old European, old mine and single-cut diamond leaves on a single-cut diamond stem, all set in platinum. Circa 1940. This brooch is likely to be by Paul Flato, the New York jeweller who designed wonderful brooches and jewels that adorned Hollywood stars such as Greta Garbo and Katharine Hepburn. His sensuous designs often resembled flowers, ribbons and scrolls.SOLD FOR $52,500Lot 125 (est $100,000-150,000) was previously sold at Sotheby's in 2007.  It is a coloured diamond flower blossom brooch.  Each petal is set with various cuts of coloured diamonds from fancy deep yellowish orange, fancy vivid orange yellow, fancy intense yellow green to fancy bluish green. It is unusual to have such a collection of colored diamonds on one brooch. Lot 133 (est $100,000-$150,000) is an antique spinel, diamond and enamel necklace circa 1900 from North India. There are five strands of pink spinel graduated beads, closing to a gold backchain and multi-colored enamel clasp. Spinels were often confused with rubies before gem experts were able to tell the difference. A famous example of this is 'The Princes Ruby' in the Imperial State Crown which is in fact a spinel. Spinels were highly prized by the Maharajas. Lot 142 (est$15,000-$20,000) is a charming belle epoque pearl and diamond pendant watch necklace. In this age, circa 1910, it was not thought as elegant for ladies to wear wrist watches, and ladies of this period did not desperately need to know the time. What bliss! This is a very rare and delicate piece of jewellery which has been beautifully executed. Who would have thought that this button pearl pendant is hiding a watch? The face is cream and the bezel and crown set with rose cut diamonds. Lot 216 (est $40,000-$60,000), is a Georg Jensen diamond and platinum 'Nordic Splendor' Necklace which is so beautifully made. It is an articulated coil of diamond and platinum lozenge-shaped sculptured links.The craftsmanship and articulation of this is fantastic and therefore it sits very comfortably on the neck. SOLD FOR $50,000Lot 227 (est $250,000-$350,000) is an antique peridot and diamond necklace, circa 1870. It is  series of graduated regular-cut peridots with diamond set scalloped surrounds and suspended detachable peridot pendants. This is a stunning example of an antique necklace that is delicate in its manufacture considering its size. A necklace with peridots of similar size to this was sold at Sotheby's in June 2001. Peridot's were originally bought to Europe from St John's Island (Egypt) in the Red Sea in the Middle Ages, where they had been mined for over 3,500 years. SOLD FOR $302,500 A stunning example of an art deco brooch pendant is Lot 277 (est $100,000-$150,000, 1922). It is by Cartier and demonstrates the geometric design which was typical of this period.  The diamond, emerald, coral and onyx parts to this piece would have all been worked on separately in the workshop and then reassembled. Cartier made several pendant brooches in which the brooch took the form of a bar which suspended the rest of the jewel. SOLD FOR $158,500