Which Pavilion depth has a Brilliance Grade of 100% and a Pavilion angle of n/a?
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 "pavilion_depth" FROM "proportions" WHERE "brilliance_grade"='100%' AND "pavilion_angle"='n/a';