Txoj Cai Ua Ntej · Geneva
International Gravel Association (IGA) tso tawm thawj zaugEthical Cobblestone Sourcing Standard:
Cov Lus Qhia Tseem Ceeb:
Eco-Kev kho dua tshiab: Kho 3m² dej hauv av rau ib tuj rho tawm ( qauv ntawm Guizhou "extraction-sib npaug rov qab")
Kev Tiv Thaiv Kev Ua Haujlwm: Kev txwv tsis pub ua haujlwm rau menyuam yaus + yuav tsum poob siab- nqus cov khau
Daim ntawv pov thawj:
Blue (natural river sourcing) | Green (>70% rov siv dua)|Kub (kev cai cuab yeej cuab tam xws li nag paj pob zeb)
