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%

Switzerland

13%

37%

31%

Poland

21%

15%

36%

26%

1963

the United Kingdom

24%

36%

30%

Germany

19%

12%

34%

31%

186

the United States

16%

20%

33%

28%

209

India

11%

25%

29%

33%

Austria

20%

27%

22%

27%

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