Multi-strand emerald and ruby bead and diamond tassel-necklace

The multiple strands of small emerald and ruby beads supporting a ruby and emerald bead tassel, each strand decorated with a diamond rondelle at the tip, surmounted by a multi-sided cap set with round and baguette diamonds and a pavé-set diamond bead, the  clasp similarly pavé-set with small round diamonds, the total diamond weight approximately 6.50 carats, mounted in 18 karat gold, length 16 inches. 

The Thurn und Taxis Collection, Sotheby's Geneva, November 17, 1992, lot 165. 

Length stated is without the tassel. Note: One strand of emerald beads is deficient as one side of the necklace has six strands and the other seven. The emerald beads on the necklace are a watery light green, the beads at the end of the tassels are slightly deeper in tone. The rubies are a deep brownish red in the necklace and a pinkish red in the tassels. Diamonds are approximately H-I color and VS-SI clarity. In good condition.
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.