Litasov et al. (2020) disagree with the interpretation we made of polycrystalline diamond aggregates, which were repeatedly found and studied by us in a variety of deposits from Kamchatka, Russia, which include those within lavas of the Avacha volcano (Kaminsky et al. 2016) and from the placer deposits of Koryakia (Kaminsky et al. 2019). These localities are separated by more than 900 km, but the diamond aggregates within have much in common. Diamond crystallites of 1–40 μm in size, comprising the aggregates, are not sintered, like in synthetic polycrystalline diamonds and natural carbonado, but instead are...

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