अच्छः स्निग्धः सप्रभो घोषवान् शीतस्तीव्रस्तनुरागश्च मणिधातुः ॥ कZ_०२.१२.१७ ॥
acchaḥ snigdhaḥ saprabho ghoṣavān śītastīvrastanurāgaśca maṇidhātuḥ
Gem-ore is (characterized as) clear, glossy, lustrous, resonant (when struck), cool (to the touch), hard/keen, and having a faint tint.
A practical test: a good stone/ore gives a clear ring or sound, indicating density/quality and helping detect inferior material.
They enable uniform valuation, protect treasury revenue, and reduce disputes/corruption in procurement.