Laing has also agreed terms to relocate the Hampshire operation to a £1 million store in Westquay Shopping Centre.
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The Parkhouse stores will be rebranded with the Laing logo and receive new interiors reflecting a “bolder, more contemporary yet timeless identity”.
Laing said: “We have built an enviable reputation in Scotland and owned the Parkhouse businesses for over 22 years. We now believe the time is right to position Laing nationally and we will be undertaking refurbishment work to our Cardiff store.
“We’re also delighted to announce plans to move our Southampton store to a new location in September.”
Laing was founded in 1840 as a manufacturer and repairer of clocks. The company expanded into jewellery in 1850 and moved into retail in 1939. Michael Laing moved the firm to Edinburgh in 1978 and opened its current showroom on Frederick Street.