Collectors will be spoilt for choice next week as more than $16 million in art goes under the hammer at Deutscher and Hackett, Smith & Singer, and Bonhams. No fewer than four million-dollar-plus paintings by blue-chip artists will be offered – three of them by Smith & Singer. The week could also see the sale of Australia’s first million-dollar diamond as Leonard Joel continues its push to expand the jewellery market, putting a 25.02 carat dazzler up for auction in Sydney on Tuesday night with an estimate of $990,000 to $1.2 million.