I acquired this stone in Tucson back in 2011 or 2012.  It is a mildly translucent yellow smithsonite from Italy that weighs 22.182 carats and measures 23.5 x 14.5 x 5.7 mm cushion cut.  I couldn't capture it very well in photos, but on the pavilion you can see some slight lighter/creamier banding.  Very unusual and large stone from an unusual locale.  Domestic shipping is free.