The Hope diamond is a minimum of a billion years old. You don’t see the original rock that carried the diamonds to the surface, but they have discovered some Kimberlites in India that do have proof of diamonds in them. Those Kimberlites date to at least a billion years old. So that implies the Hope diamond and similar diamonds present in India have been delivered to the floor no less than a billion years in the past and perhaps longer ago. So we’re comfortable saying that the Hope Diamond is at the least a billion years previous. When you take a look at the age spread of most different diamonds, it is in all probability much older that that.
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