Strong cultivar which grows from a shrub shape into a small tree with a pyramidal crown from 4 to 6 m. The twigs and branches are very contorted and twisted. Like the species, they are brownish red. The quite thick mature bark is grey-brown to reddish brown, later scaling. The soft needles are in clusters of 40 - 50 on short shoots along the older twigs. On (year-old) long shoots, they stand alone. Like the twigs and branches, the blue-grey needles are also very curved and twisted. In autumn, they turn golden yellow before falling off. ‘Diana’ transforms itself into a graceful tree on all soils except acidic.