CREATE TABLE table_62330 ("Month" CLOB, "15th- 20th century" CLOB, "U.S.  ( 1912 ) " CLOB, "U.S.  ( 2013 ) " CLOB, "Britain  ( 2013 ) " CLOB, "Hindu" CLOB)

Which month in 2013 did the U.S. use the ruby birthstone?
SELECT "Month" FROM table_62330 WHERE "U.S. (2013)" = 'ruby'
SELECT "Month" FROM "table_62330" WHERE "U.S. (2013)" = 'ruby'