Police say they are searching for four diamond thieves after the theft of a diamond necklace worth more than $4.6 million in Hong Kong, Agence France-Presse reports. One of the thieves is reportedly a girl between 12 and 14 years old.

The three adults posed as "big spenders" to distract the shop's employees, an unnamed police source told the South China Morning Post.

Meanwhile, the girl stole a key to open the cabinet containing the necklace—"embedded with more than 30 diamonds totalling about 100 carats," the Post's source said—and lifted it off the display bust.

The other thieves, two women and one man, are all estimated to be aged between 30 and 40 years old. The four reportedly remained in the shop for about a half-hour before leaving without buying anything.

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