Ralph Esmerian, disgraced jeweler to the stars, was sentenced yesterday to six years in the slammer for secretly selling off pricey bling he used as collateral for more than $200 million in loans.

Manhattan federal Judge Denise Cote also ordered the 71-year-old, fourth-generation gem merchant to perform 1,800 hours of community service and to forfeit $20 million reaped from the illicit scheme.

Esmerian said he was “a stranger to myself” living in a “very private hell” after failing to save his business.