Raw gemstones set in hammered silver with a split shank at the front. These gemstones have not been polished and have an individual raw appearance. 

From left to right.

Left Apatite Ring            A vivid sky blue gemstone set in hammered silver . Size R1/2

Middle Tanzanite Ring    A purple/blue gemstone set in hammered silver with gold plating around the stone. size R

Right Moonstone Ring    A white gemstone with a blueish sheen set in hammered silver  Size P

Weight 3 to 3.4 grams     Average stone size 0.7cm x 0.9cm

The other rings in the second image can be found in Raw Gemstone Rings 1.