One of them is a complete necklace. The other two are slides without attached chains.
From top to bottom, left to right:
1. Sterling and fine silver, copper, trilobite fossil, faceted garnet
2. Sterling and fine silver, hand-cut phosphosiderite-sodalite intarsia
3. Copper and fine silver, copper and bronze PMC, hand-cut azurmalachite cabochon, silk ribbon