CREATE TABLE "diamond_simulants_and_their_gemological_" (
  "material" text,
  "formula" text,
  "refractive_index_es_589_3nm" text,
  "hardness_mohs_scale" text,
  "density_g_cm_3" text,
  "state_of_the_art" text
);

Question: What hardness has a formula of y 3 al 5 o 12?
SQL: SELECT "hardness_mohs_scale" FROM "diamond_simulants_and_their_gemological_" WHERE "formula"='y 3 al 5 o 12';

Question: Which formula has a refractive index 589.3 at 1.97?
SQL: SELECT "formula" FROM "diamond_simulants_and_their_gemological_" WHERE "refractive_index_es_589_3nm"='1.97';

Question: How much is the density with a hardness of ~ 8.3?
SQL: SELECT "density_g_cm_3" FROM "diamond_simulants_and_their_gemological_" WHERE "hardness_mohs_scale"='~ 8.3';

Question: Which material has a hardness of 8.25?
SQL: SELECT "material" FROM "diamond_simulants_and_their_gemological_" WHERE "hardness_mohs_scale"='8.25';