मनोनेत्राभिरामं च तपनीयगुणाः स्मृताः ॥ कZ_०२.१३.६१च्द् ॥
manonetrābhirāmaṃ ca tapanīyaguṇāḥ smṛtāḥ
These are remembered as the qualities of refined gold: it should delight both mind and eye.
It summarizes the combined criteria (uniformity, finish, luster, stability) into an easily communicable procurement norm.