CREATE TABLE table_203_385 (id DECIMAL, "material" TEXT, "formula" TEXT, "refractive\ index ( es ) \ 589.3 nm" TEXT, "dispersion\ 431 - 687 nm" DECIMAL, "hardness\ ( mohs'\ scale ) " TEXT, "density\ ( g/cm3 ) " TEXT, "thermal\ cond." TEXT, "state of\ the art" TEXT)

how hard is a diamond ?
SELECT "hardness\n(mohs'\nscale)" FROM table_203_385 WHERE "material" = 'diamond'
SELECT "hardness\n(mohs'\nscale)" FROM "table_203_385" WHERE "material" = 'diamond'