Kavyalankarasarasamgraha 7.53

7.53

atra vibhūṣaṇavinyāsāspadabhūtā ye kaṇṭhādayastadavaśiṣṭānāmaṅgānāṃ yāsau kāntiḥ dīptiḥ tasyā anujjvalā malinā yāsau chāyā śobhā sā liṅgaṃ, tatsāmarthyācca bhūṣāvinyāsapradeśānāṃ bhūṣaṇasaṃbandho 'tīto 'numīyate /
tena tatkāvyaliṅgam //

Here, with respect to the radiance, i.e., brilliance, of the limbs other than the neck and so forth which served as the places for placing ornaments, that dim, dirty luster, i.e., beauty, is the sign; and through its efficacy, a past connection with ornaments in the areas where ornaments were placed is inferred. / Therefore, that is poetic reason.