Both CNBC and the Daily Beast report that millennials are buying fewer diamonds, for reasons of cost and ethical concerns. Other sources dispute this alleged trend. Regardless, if you've ever wondered where jewelry comes from, this is a chance to find out. We talk about ways you can be sure you understand -- and are comfortable with -- the conditions in which jewels and metals are sourced. Our guests: Maressa Merwarth, designer and metalsmith and founder of Mari Tome Jewelry Design Robert Mann,