The best replacement for 14k is 18k white gold.

The best alternatives to 14k are rated as following:
★★★★★  18k white gold
★★★★★  18k
★★★  18k gold
★★★  10k
★★★  10k gold
★★  24k
★★  18k rose gold
★★  14kt
★★  24k gold
★★  10k white gold
★  18k yellow gold
★  18k white gold better
★  18k ring
★  10k gold worth more
★  20k
  18k which is better
  20k metal halide
  10k yellow gold
  18k gold ring
  18k better
  19k white gold
  sun yee on
  24 k gold
  9k gold
  10k which is better
  10k better
  aur 18k
  20k halide

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Speaking about 14k, one probably shouldn't forget about cz.

Other search terms related to 14k and their ratings are:
★★★★★ cz
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14k
18k white gold
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