1. Beijing Jewelry Wholesale Market: There are jewelry wholesale markets in Beijing, such as Beijing Jewelry City and Beijing Jewelry Wholesale Market. These markets have all kinds of jewelry materials and accessories for wholesale, including rope materials for weaving bracelets and necklaces.

2. Beijing's clothing market: Beijing's clothing market is also an option to consider. These markets have all kinds of fabrics and accessories for wholesale, including rope materials suitable for weaving bracelets and necklaces.