Who own the most diamonds in the world?

Could you please elaborate on who currently holds the title of owning the largest collection of diamonds in the world? Are we referring to individuals, corporations, or perhaps even governments? Are there any notable figures or organizations that have been in the spotlight for their diamond holdings, and if so, what makes their collection so significant? Additionally, are there any trends or factors that have contributed to the accumulation of diamonds by these entities, and how do they ensure the security and preservation of their valuable assets?