Designed as a blue marlin, the head pavé-set with circular-cut sapphires and brilliant-cut diamonds, the fins and head pavé-set with similarly cut diamonds, the tongue embellished with a cabochon ruby, 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, pgs. 92-93 for an illustration of this brooch. 

Signed Michele della Valle, numbered 090730, Italian maker's mark. Italian assay mark for 18 carat gold. Carbon fiber in overall good condition. Sapphires blue of light to strong saturation, with small scratches and nicks. Ruby purplish red of medium strong saturation. Diamonds estimated to weigh a total of approximately 6.00 - 6.50 carats, on average G-I colour, VS-SI clarity, as gauged and graded in the mount. Little signs of wear to the metal. Clasp secure, sliding safety catch. In very good condition. Gross weight approximately 20 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."