In 1912 when the U.S used sapphire, what was the Hindu birthstone?
CREATE TABLE "birthstones_by_cultures" (
  "month" text,
  "15th_20th_century" text,
  "u_s_1912" text,
  "u_s_2013" text,
  "britain_2013" text,
  "hindu" text
);
SELECT "hindu" FROM "birthstones_by_cultures" WHERE "u_s_1912"='sapphire';