Subheading 6802.21 · Section XIII
6802.21 Marble, travertine and alabaster; simply cut or sawn, with a flat or even surface
68 Stone, plaster, cement, asbestos, mica or similar materials; articles thereof
6802 Monumental or building stone, worked (except slate) and articles thereof (not of heading no. 6801) mosaic cubes etc., of natural stone including slate; artificially coloured granules of natural stone
6802.21 Simply cut or sawn, with a flat or even surface
Other subheadings under 6802
6802.10 Whether or not rectangular (including square), largest face of which is capable of being enclosed in square, side less than 7cm, coloured granules, chippings, powder 6802.23 Articles thereof, simply cut or sawn, with a flat or even surface 6802.29 Monumental or building stone, n.e.c. in item no. 6802.2, articles thereof, simply cut or sawn, with a flat or even surface 6802.91 Articles thereof, (other than simply cut or sawn, with a flat or even surface) 6802.92 Calcareous (excluding marble, travertine, alabaster) articles thereof, (other than simply cut or sawn, with a flat or even surface) 6802.93 Articles thereof, (other than simply cut or sawn, with a flat or even surface) 6802.99 Natural (excluding marble, travertine, alabaster, other calcareous stone or granite), monumental or building stone, (other than simply cut or sawn, with a flat or even surface)
For Indian shipping bills you need 8 digits. These six-digit codes are the international HS 2022. India's ITC(HS) classification (DGFT) and Customs Tariff (CBIC) add two more digits for the national tariff line, so pick the 8-digit line under your 6-digit code there, and confirm with your customs broker for anything borderline.