Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_1 (britain__2013_ VARCHAR, us__2013_ VARCHAR)

### Question ###
What was Britain's (2013) birthstone when the U.S (2013) birthstone was ruby?

### Accurate SQL ###

SELECT britain__2013_ FROM table_name_1 WHERE us__2013_ = "ruby"