Celebrity jeweler I. Friedman & Son is moving to 20 W. 47th St. this week, just one of many jewelry tenants scattering as the Diamond District continues to be redeveloped by Gary Barnett.

Robbie Friedman, whose grandfather I. Friedman founded the company in 1922, said its longtime location at 10 W. 47th St. is one of many being gobbled up by Barnett, a former diamond merchant whose company, Extell Development, is now rooted in luxury real estate.

“The street is being literally taken apart,” lamented Friedman, whose clients include many in the real estate industry.

Friedman feels lucky to have leased another shop with a window on 47th Street. Booths can run $3,000 to $15,000 a month and windows at the new 50 W. 47th St., which Barnett developed mid-block, are renting for as much as $38,000 a month. That retail condo now belongs to a Turkish company, while SL Green owns the top of the new office tower, where many jewelers also own their own offices.

Friedman’s grandfather began the first jewelry exchange at 70 Bowery, which the family still owns and operates along with Nos. 72, 74 and 76. In the 1970s, they moved their own business to 10 W. 47th.

“I am concerned about the industry and don’t want the identity of the diamond industry to be lost because of the real estate industry,” said Friedman, who added that hundreds, if not thousands, of jewelers, polishers, stonecutters, stone setters, runners and administrative professionals work on the street.

Barnett started buying parcels years ago for the International Gem Tower, and now also controls most of the eastern end of the block that runs between West 46th and 47th streets, either through outright purchases or from air rights along Fifth Avenue.

While earlier reports stated Barnett is building a 40-story hotel, on Monday, he told me he didn’t know what he was building.