Both items are expected to fetch a combined sale of $US12.5 million ($AU17.42 million).
A legendary 101.41-carat pear-shape D internally flawless diamond named ‘The Juno’ after the ancient Roman queen deity, it is on record as the fourth-largest pear-shape diamond to go on auction.
The Juno is a type IIA stone that is considered “extremely uncommon” in natural diamonds, according to a statement from Sotheby’s, which makes it a highly sought piece especially among “members of the 100-carat club”.
The diamond is the highest valued lot in the tender and is expected to fetch an estimated $US10 million ($AU13.93 million).
Another piece is the Earth Star, an extremely rare 111.59-carat cut and polished pear-shape, fancy deep orange-brown diamond and considered the second-largest diamond to go on auction weighing more than 100 carats .
The stone originally came from 248-carat rough diamond discovered at the Jagerforstein mine in South Africa in 1967. It was sold for a little less than $US1 million in 1983 to a private buyer.
The Earth Star is making its first public appearance after almost 40 years as a pendant set on an azurmalachite gemstone designed by David Webb. It is estimated to fetch around $US1.5 to $US2.5 million.
The diamond was featured in the Famous Diamonds book written by Lord Ian Balfour.
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The Earth Star; Set by David Webb