DUBAI, Nov 4 (Reuters) - DIFC Investments, the investment arm of Dubai&aposs financial free zone, has launched a $700 million 10-year sukuk at 185 basis points (bps) over midswaps on Tuesday, according to a document from lead arrangers.Pricing of the sukuk tightened several times with investor orders topping $3 billion, the document said.On Monday, the sukuk was marked initially at very low 200 bp