I got a question for you: An eternity ring, also known as an infinity ring, is a lady's ring, worn on the hand, comprising a band of precious metal (usually gold) set with a continuous line of identically cut gemstones (usually diamonds) to symbolize never-ending love, usually given by a husband to his wife on the occasion of a significant anniversary, typically after 10 years of marriage date Because the presence of stones all the way round the eternity ring can make it cumbersome to wear, the alternative is to have the stones across the face of the ring only. This is sometimes referred to as a "half-eternity" ring rather than a "full" eternity ring.

Answer this question: when does a husband buy an eternity ring?
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The relevant information is: An eternity ring, also known as an infinity ring, is a lady's ring, worn on the hand, comprising a band of precious metal (usually gold) set with a continuous line of identically cut gemstones (usually diamonds) to symbolize never-ending love, usually given by a husband to his wife on the occasion of a significant anniversary, typically after 10 years of marriage date Because the presence of stones all the way round the eternity ring can make it cumbersome to wear, the alternative is to have the stones across the face of the ring only.
Therefore, the answer is on the occasion of a significant anniversary , typically after 10 years of marriage date.