My summer home is in northeastern Arizona close to Gallup, NM a great source of signed turquoise and sterling silver jewelry. Years ago I did a limited amount of silversmithing, enough to convince me to leave it to the Native Americans.
For years my favorite stone to work with was turquoise combined with sterling silver findings. In addition to turquoise and I often incorporate pendants created by Native American or those imported into drop style necklaces. This is included in the item description complete with hallmarks if available. I also combined turquoise with other gemstones such as carnelian, amethyst, tiger's eye as well as coral and amber as well.