Diamond (or micro-diamonds) in meta-ophiolites have been found in the NW Alps. The occurrence of diamonds depends on the tectono-metamorphic evolution that the rock has suffered. Not necessarily it can be found in ophiolite. Up to now, it has been found within garnet in metasediments.

Yes, but it is microdiamonds, not diamonds, that are present. These microdiamonds are found in the Moa-Baracoa ophiolite complex in western Cuba, associated with minerals such as forsterite, diopside, tremolite, lizardite, and enstatite. The microdiamonds are specifically into within forsterite.

Yes, if ultra-high pressures are formed in the purple structure due to dehydration.