Designed as a feather, set with brilliant-cut diamonds and diamonds of black tint, signed Michele della Valle, numbered, Italian assay and maker's marks, pouch stamped Michele della Valle.

Cf.: Michele della Valle, Michele della Valle, Jewels and Myths, Woodbridge, 2014, pg. 109 for an illustration of a similar brooch. 

Please note that the diamonds of black tint have not been tested for natural colour. Signed Michele della Valle and MdV, Italian maker's marks. Mounted in zirconium, Italian assay mark for 18 carat gold. Diamond of black tint well matched in colour. Diamonds estimated to weigh a total of approximately 7.50 - 8.50 carats, on average G-I colour, VS-SI clarity, as gauged and graded in the mount. Little signs of wear to the metal. In very good condition. Gross weight approximately 44 grams. Pouch stamped Michele della Valle.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Please note that colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's. We do not guarantee, and are not responsible for any certificate from a gemological laboratory that may accompany the property. We do not guarantee that watches are in working order. 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. Prospective buyers should also refer to refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue, in particular to the Notice regarding the treatment and condition of gemstones.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."