We use Foss Science and at the end of investigation 2 there is a brief story about birthstones. My students were super interested and excited to research more on their birthstones that I decided to create an online scavenger hunt. Students are given websites and are instructed to go to those websites to find the answers on their worksheet.
As an extension I had students create a poster, brochure or any type of visual they feel would best display what they learned about their birthstone. I only require that the students include their research on their visual. The rest is open to their creativity!