Diya (Arabic: دية; plural diyāt, Arabic: ديات) in Iran's law, is the financial compensation paid to the victim or heirs of a victim in the cases of murder, bodily injury or property damage.
It is an alternative punishment to qisas (equal retaliation). In Arabic, the word means both blood money and ransom, and it is spelled sometimes as diyah or diyeh.
The amount of compensation is based on the percentage of responsibility. Blood money is to be paid not only for murder, but also in the case of unnatural death, interpreted to mean death in a fire, industrial or road accident, for instance, as long as the responsibility for it falls on the accused. The diyah compensation amount depends on the religion of the victim.
It only applies when victim's family want to compromise with the guilty party; otherwise qisas applies.
Is Islamic law, Qisas is necessary in intentional accidents if curt and the victim or heirs of a victim ask but in unintentional accidents, paying blood money is enough.