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A judge Tuesday sentenced to a year of probation the La Crosse teenager who stole a $51,000 diamond necklace from her mother and sold it for $100.

Penelope Friends, 18, pleaded guilty to misdemeanor theft in La Crosse County Circuit Court. She must complete 200 hours of community service, and her case may be expunged if she completes probation.

“Ms. Friends, there is one word for you, and that’s thief,” Circuit Judge Todd Bjerke said.

An employee at Helzberg Diamonds in Valley View Mall in July offered Friends $50 for the necklace, which she refused because she guessed the necklace’s value was “much higher,” according to police reports.

Friends had it appraised at Rogers & Hollands jewelers, which contacted the FBI’s La Crosse office, suspecting theft.

Helzberg employee Gunnar Winchell approached Friends on a break and bought the necklace for $100, according to reports.

Winchell told an FBI special agent that he was “the victim here,” reports stated. He said he suspected the necklace was stolen and “was going to try to get to the bottom on it.” He didn’t explain why he didn’t call police.

The FBI recovered the 4.6-carat diamond necklace.