London-based investment firm Pemberton Asset Management acquired the auction house for an undisclosed amount.
Blue Nile CEO Harvey Kanter Steps Down
He has resigned after five years at the helm of the online diamond seller and will be replaced the former head of Target.com.

Seattle--Blue Nile President and CEO Harvey Kanter has resigned and been replaced by the former head of Target.com, the e-tailer announced Thursday.
Jason Goldberger, 45, will take over at Blue Nile on Monday, with Kanter remaining on as the chairman of the company’s board of directors.
He spent the last four years as the chief digital officer and president of Minneapolis-based Target.com. He left that job in October 2016.
Goldberger, who is a graduate of Colby College in Waterville, Maine, also serves on the board of directors of American Family Insurance.
He will relocate to Seattle for the job.
Kanter’s resignation and the appointment of Goldberger comes less than a year after the once publicly traded diamond e-tailer was acquired and taken private.
“As the board and I discussed succession planning, we agreed this is the right time to bring in a new CEO to lead the company’s next phase of growth,” Kanter said in a statement issued by the now-private company. “Jason is an experienced leader with deep e-commerce experience who will work closely with the team.”
Kanter became CEO of Blue Nile in 2012, replacing Diane Irvine. He came to the Seattle-based e-tailer from Moosejaw Mountaineering and Backcountry Travel Inc., a Detroit-based maker of outdoor gear and apparel.
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