The only color which sapphire cannot be is ...

orange

yellow

red

black

The only color which sapphire cannot be is red – as red colored corundum is called ruby, another corundum variety. Pink colored corundum may be either classified as ruby or sapphire depending on locale.

irrational_cat wikipedia → Sapphire

minerals

Minerals quiz

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Answers by country

Australia

70%

23%

Ukraine

26%

42%

26%

Greece

21%

14%

42%

21%

Poland

21%

15%

36%

26%

1947

the United Kingdom

25%

35%

29%

Switzerland

14%

35%

32%

Germany

20%

12%

34%

31%

182

the United States

16%

21%

32%

28%

201

India

11%

25%

29%

33%

Austria

17%

28%

23%

28%

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