Engagement gift (both words suit this puzzle's theme)

Question:

Answer:

DIAMONDRING

Length:

Similar Crossword Questions:

Traditional location of one of this puzzle's theme words
What this puzzle's theme words aim to do
Choice words swapped in this puzzle's theme answers
What the self-contradictory words found in this puzzle's theme answers are examples of
Question not asked in this puzzle's theme words
Famous last words (and homophonically, a hint to this puzzle's theme)
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Gift card phrase, a homophonic hint to the puzzle's theme
"Magic" words that are the theme of this puzzle
Like the theme words in this puzzle?
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Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
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Place to use this puzzle's theme words?
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Goal of most games (and a hint to this puzzle's theme)
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Finding from the "fifths" taken from this puzzle's theme answers