छेदश्चिक्कणः समवर्णः श्लक्ष्णो मृदुर्भाजिष्णुश्च श्रेष्ठः ॥ कZ_०२.१३.२५ ॥
chedaś cikkaṇaḥ samavarṇaḥ ślakṣṇo mṛdur bhājiṣṇuś ca śreṣṭhaḥ
The best specimen is one whose cut surface is smooth and glossy, of uniform colour, fine-textured, soft, and lustrous.
Because surface plating can deceive streak tests; examining a cut exposes internal consistency and deters sophisticated fraud.