A police spokeswoman said the man is due to appear at Hastings District Court on Monday.
Nichols said suspicions arose when a man wearing a bucket hat, sunglasses and gardening gloves entered the store and began to browse the watch section.
"I asked him to leave as we didn't feel comfortable," she said.
"We had a feeling he was going to do something when he asked us to move the stuff off the top of the watch cabinet. He refused to leave and said we needed to take the stuff off the cabinet or he was going to take the whole thing."
Nichols said she attempted to grab the cabinet, before a short struggle ensued.
"There was a tussle, but I thought he might get violent so I left it and he ran out into a waiting car with the watch case," she said.
A police spokeswoman previously said a person reportedly left with a jewellery cabinet and its contents.
"No one was injured during the incident," she said.
Police inquiries into the incident are ongoing.