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It seems the Buddist customer was trying to sell a gold hair clip. According to an article in The Irrawaddy dated 12 April 2013:
The argument began after a Buddhist woman accused employees of damaging a gold hair clip that she wanted to sell, according to Reuters reports. One shop owner slapped the woman and three employees beat her husband outside, the news agency reported, citing witness testimony.
Tensions in the region between the Muslim and Buddhist communities were already running high. In response to the assault on the Buddhist customers,
A crowd of mostly Buddhists arrived at the scene and started throwing rocks and yelling anti-Muslim insults, Reuters reported. They eventually destroyed the shop and surrounding businesses.
From the same newspaper article, on Thursday 11 April 2013,
The two owners and one employee of New Waint Sein gold shop were each sentenced ... to 14 years in prison for aggravated assault, robbery, attempted injury, and aiding and abetting crimes