If you think your boyfriend might become one of the most famous rock stars in history, then you might want to save a lock of hair for the future. Creepy? Yes. But also rewarding.

A lock of Mick Jagger’s hair is going to be up for auction. According to Fox News, a lock of Jagger’s hair and a statement of provenance will be up for sale through British auction house Bonham’s on July 3. The statement will be from Chrissie Shrimpton, Jagger’s girlfriend in the early 1960s. Shrimpton dated the star during and just after he was a student at the London School of Economics. He left the school in 1963 to pursue his music career. The lock was kept thanks to the work of a Shrimpton’s sneaky grandmother.

“Unbeknown to her at the time, this lock was saved by her grandmother when Mick and Chrissie were staying at her parents’ farm,” reads Bonham’s description of the item. “Apparently, on her grandmother’s death, the hair passed to Chrissie’s aunt, and when she died, the hair was returned to Chrissie by a cousin taking care of personal effects.”

The hair comes packaged in a “small paper envelope inscribed ‘Mick Jagger’s hair after being washed and trimmed by Chris at Rose Hill Farm.”

Bonham’s expects the item to sell for a price somewhere between $2,300 and $3,100. This price is between what was received for Keith Richards’ and John Dillinger’s hair. A clump of Keith Richards’ hair sold for $1,400 during a recent auction and Dillinger’s hair sold for $5,400. Strands from Ulysses S. Grant, Robert E. Lee and Abraham Lincoln have sold for $5,975, $12,500 and $38,837, respectively. All proceeds will go to the charity Changing Faces.