यथाहस्तमवशेषः षडरत्निः पञ्चारत्निश्च ॥ कZ_०२.३१.१५ ॥
yathāhastamavaśeṣaḥ ṣaḍaratniḥ pañcāratniśca
The remainder (i.e., the rest of the classification) is according to hand-measure: the six-ratni and the five-ratni categories.
It indicates a practical field protocol for quick assessment when full measurement apparatus is unavailable, while still keeping categories consistent.