user: Question: In 1912 when the U.S used sapphire, what was the Hindu birthstone?
Columns: ['Month', '15th- 20th century', 'U.S. (1912)', 'U.S. (2013)', 'Britain (2013)', 'Hindu']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['January', 'garnet', 'garnet', 'garnet', 'garnet', 'serpent stone']
SQL:

assistant: SELECT "Hindu" FROM "Table" WHERE "U.S. (1912)" = 'sapphire';