Awaking from the summer lull for jewelry auctions, Leslie Hindman revs up the autumn season with an exciting Important Jewelry sale scheduled for Sunday, September 11th through Monday, September 12th. The Chicago-based auction house has put together a helluva September sale packed with impressive diamonds and colored stones, signed jewels by the usual suspects as well as modernist designers, and important antique pieces. Diamonds & Colored Stones Leading the auction in terms of estimate value is an electric blue Kashmir sapphire. Weighing 6.40 carats, the antique cushion cut beauty is estimated to fetch up to $250,000. Kashmir sapphires of this size and cut have averaged roughly $60,000 to 70,000 per carat at auction in the last year, so the one in this auction should exceed its high estimate comfortably.   While Kashmir sapphires are the rarest and most coveted of blue corundum, other sources can produce similarly beautiful shades of blue, and this sale features a handful of fine examples. A pair of floral earrings by Julius Cohen (est. $60,000-80,000) feature a pair of cushion cut blue sapphires originating from Thailand. While not among the top three sources for sapphires, these Thai sapphires are incredibly rare as they exhibit the desirable traits for a […]