Both will be grated as 10 on the Mohs scale, the highest number to indicate the hardest mineral.
Mined diamonds are more valuable than manufactured diamonds, as gemstones. This may not be a consideration for you, in which case, you would own a manufactured diamond.
Both kind of diamond are made from carbon. Mined diamonds are formed by Mother Nature; manufactured diamonds are formed by machines in a laboratory. Both rate 10 on the Mohs scale of hardness. A natural diamond will be much more highly valued than a man-made diamond, given that both are gem-stone quality. As with mined diamonds, most manufactured diamonds have industrial applications, and are not used as gemstones.
The choice is totally up to you. A mined stone, if its colour, cut, clarity and carat weight merit, may hold a higher re-sale value than a manufactured diamond. However, if investment criteria don't matter, but initial price matters, you should pay less for the manufactured diamond, given the four Cs (above).
Mined.
Germanium is not manufactured; its ore is mined then refined into germanium.
Mined or natural diamonds are more expensive than man-made diamonds. If monetary value is an advantage, then a mined diamond has the advantage of value.
Neoprene is not a mineral so it isn't mined. It is a synthetic rubber that is chemically manufactured.
Diamond is harder than onyx.
Diamond is harder than plastic.
The Cullinan was mined in South Africa, in 1905.
If it's a mined diamond, the diamond is as old as the earth itself.
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