Fancy colored diamond and diamond necklace

Centering a pear-shaped diamond of fancy brown-pink color weighing 4.11 carats, above a cluster of 5 pear-shaped diamonds together weighing approximately 3.25 carats, completed by an 18 karat white gold necklace of polished and curved side segments completed by flexible back links, length approximately 17 inches, signed Jose Hess, numbered 155265. 

See GIA report stating the center diamond is Fancy Brown-Pink, Natural Color, and VVS2 clarity, with potential to be flawless. The additional diamonds are approximately G-H color and VS clarity. In good condition and fitted with a safety closure. Signed Jose Hess and numbered on back of clasp.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion. Illustrations in the catalogue may not be actual size. Prospective purchasers are reminded that, unless the catalogue description specifically states that a stone is natural, we have assumed that some form of treatment may have been used and that such treatment may not be permanent. Our presale estimates reflect this assumption.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

Accompanied by GIA report no. 16303542 stating that the diamond is Fancy Brown-Pink, Natural Color, VVS2 clarity; together with original working diagram stating that the stone may be potentially flawless. 

Also accompanied by a letter stating:  "According to the records of the GIA Laboratory, the 4.11 carat pear brilliant cut diamond described in report  #16303542 has been determined to be a type IIa pink diamond. Type IIa pink diamonds are very rare in nature, often have relatively few inclusions and are noted for their mostly homogenous color in the rough. Unlike many other colored diamonds, the color in pink diamonds can not only be caused by impurities, but it may also be a result of the diamond's exposure to heat and pressure during transportation into the earth's crust. Type IIa pinks have been found in a number of mining regions around the world. Historically they were found in India (particularly from the Golconda region) and, in more recent times, most notably from Brazil and Africa. 

Among famous gem diamonds, the 70.39 carat Empress Rose and the 28.15 carat Agra are examples of type IIa pinks."