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It happened at Quick Service Jewelry Design late Thursday inside the Eastridge Mall in East San Jose.
Officers say four masked suspects entered the business with hammers and started smashing display cases.
They took several items and then left on foot.
No one was hurt.
VIDEO: More than $50K in merchandise stolen from Lululemon in Santana Row and Westfield Valley Fair Mall
$50K in merchandise stolen from Lululemon and Valley Fair in SJ