Move reflects market shift to higher-value diamonds.
Category: Polished
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D-color stone expected to fetch up to $4 million at auction.
Diamond necklace leads auction with price of $5.9 million.
26.12-carat, D-flawless diamond leads Jewels and Jadeite auction.
Tassel necklace by Van Cleef & Arpels more than doubles its high estimate.
13.15-carat piece was set to lead New York Magnificent Jewels auction.
Fancy-vivid pink diamond ring expected to fetch up to $200,000.
4.32-carat stone among several pieces that beat estimates.
Pinks and blues also enjoyed third-quarter gains
Pear-cut, 31.62-carat stone set in pendant a top item at New York Magnificent Jewels.