I think it is possible to be diamond bearing rocks in ophiolites.

Yes, there can be stones containing diamonds in the ophiolite, but often these diamonds are microdiamonds, as in the case of the Moa-Baracoa Complex in Cuba. Diamonds can be found in specific environments of ultramafic rocks like chromite and peridotite mantle. However, it is advisable to verify the sources and related information.

Kimberlite is associated with some peridotites. Refer best to journals and get a general overview from Google.

Octahedral microdiamonds replaced by graphite have been described from peridotites-pyroxenites in Beni Bousera Massif (Morocco)

Certainly. There are numerous godsends in Pacific Ring, for example in Koryak mountains near Bering sea, in Kamchatka, in Japan, in old ophiolites of Jugjuor ridge near Okhotsk sea, in Ural Mnts etc. Moreover, some objects in Jugjour and Ural were objects for commercial evaluation. But they revealed to be too poor and diamonds in ophiolites are too small, rarely more than 100 mcm.