SB 8.15.17

yatra nitya-vayo-rūpāḥ
 śyāmā viraja-vāsasaḥ
bhrājante rūpavan-nāryo
 hy arcirbhir iva vahnayaḥ
Word for word: 
yatra — in that city; nitya-vayaḥ-rūpāḥ — who were ever beautiful and young; śyāmāḥ — possessing the quality of śyāmā; viraja-vāsasaḥ — always dressed with clean garments; bhrājante — glitter; rūpa-vat — well decorated; nāryaḥ — women; hi — certainly; arcirbhiḥ — with many flames; iva — like; vahnayaḥ — fires.
Translation: 
Everlastingly beautiful and youthful women, who were dressed with clean garments, glittered in the city like fires with flames. They all possessed the quality of śyāmā.
Purport: 

Śrīla Viśvanātha Cakravartī Ṭhākura gives a hint of the quality of the śyāmā woman.

śīta-kāle bhaved uṣṇā
 uṣma-kāle suśītalāḥ
stanau sukaṭhinau yāsāṁ
 tāḥ śyāmāḥ parikīrtitāḥ

A woman whose body is very warm during the winter and cool during the summer and who generally has very firm breasts is called śyāmā.