(Perthnow) - THEY might look like ordinary grapes, but this Swan Valley chardonnay bunch are worth about $25a kilogram. That's according to a new study looking at how much the region's grape industry is worth to WA. In the past year, the valley's wine businesses have turned over more than $90 million, according to estimates by the region's winemakers' association. Critical to that turnover is the 3500 tonnes of grapes the 42 wineries will harvest over the next six weeks, ahead of pressing, crushing and fermenting.