Another eco-friendly engagement ring option is one that includes synthetic gemstones, like lab-created diamonds or moissanite for example. Lab-created stones mirror the physical and chemical characteristics of a real gemstone for a fraction of the price, so they’re also a great money-saving option. Most importantly, however, an engagement ring that uses a synthetic gemstone in its design, is an environmentally friendly one, since colored gemstones (although mined from smaller digging sites) can still have negative repercussions on the environment.