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In page Engagement ring:

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In South Africa, diamonds were first found in 1866, although they were not identified as such until 1867.[1][2] By 1872, the output of the diamond mines exceeded one million carats per year.[3] As production increased, those of lesser means were able to join in on this movement. However, diamond engagement rings were for a long time seen as the domain of the nobility and aristocracy, and tradition often favoured simpler engagement bands.[citation needed]