The best replacement for si1 is vs2.

The best alternatives to si1 are rated as following:
★★★★★  vs2
★★★  si2
★★  i1
★★  vs2 diamond
★  vs1
★  h vs2
★  si2 diamonds
★  vs2 diamonds
★  g vs2
  si2 diamond

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si1
vs2
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