Start a blog about gemstones and jewelry, of course, catering to a female audience. Gemstone jewelry is always in demand, and women are the primary target market for this niche.
Along with informational gemstone articles, share the latest from gemologists, jewelry designers/stores, or gemstone sellers with an eye for aesthetics. Under this main idea around gemstone jewelry, you should try to cover specific gemstone types, jewelry design, historical/astrological significance, and maintenance instructions/tips. The venture can be extremely profitable for your own gemstone jewelry business (if any) or from selling as an affiliate with jewelry stores/suppliers. A good quality blog in this niche can attract lucrative sponsored posts by jewelry brands.
Blog Name Idea: GemsForHer.com