Sand and gravel.
Cut and polished precious stones like emerald, ruby.
Semi precious stones like ruby, emerald.
Sand and gravel.
Mother of pearl.
Pearl strands, pearl beads, loose pearls include round freshwater pearls, nugget pearl, button pearl, rice pearl, potato pearl, wheat pearl, top drilled pearls, coin pearl, blister pearl, keishi pearl, biwa pearl, loose freshwater pearl, akoya pearl strands.