Which Brilliance Grade has a Crown angle of 41.1°?
CREATE TABLE "proportions" (
  "benchmark" text,
  "crown_height" text,
  "pavilion_depth" text,
  "table_diameter" text,
  "girdle_thickness" text,
  "crown_angle" text,
  "pavilion_angle" text,
  "brilliance_grade" text
);
SELECT "brilliance_grade" FROM "proportions" WHERE "crown_angle"='41.1°';