GOOD EVENING. LIKE WITH CENTRAL IRAN, PLEASE DESCRIBE THE ROCKS IN EASTERN IRAN THAT YOU HAVE FOUND. POTENTIALLY DIAMONDIFEROUS ROCKS ARE FOR EXAMPLE THE ULTRAMAFIC LAMPROPHYRES (UML). UML HAVE BEEN FOUND NEAR EASTERN IRAN, IN PAKISTAN (SEE MUHAMMAD ET AL. 2019).
There are also so-called micro-diamond deposits apart from the classical deposits. Moreover even source rocks no longer exposed can show their legacy in form of diamond placer deposits because diamands can survive mutliple reworking processes. See below the potential source rocks for diamond and their deposits:
1)Magmatic deposits
1)Diamond in komatiites, lamprophyres and other ultrabasic rocks
2)Diamond in peridotites of ophiolite sequences
3)Diamond deposits bound to kimberlites
4)Diamond deposits bound to lamproites
2)Sedimentary deposits
1)Placer deposits
2)Alluvial-fluvial and nearshore-marine modern diamond placer deposits
Some sources suggest that there is a possibility of finding diamond-bearing rocks in some regions. According to one website, diamond particles have been discovered in Sistan and Baluchestan province, which is located in the east of Iran.