Moonstone
The most valuable moonstones are blue. Moonstones can also be pink, white, grey, green or brown.
In moonstone jewelry, the gemstones are usually cut as cabochons, like the face of a moon. The moonstone is translucent, with dancing rainbow light that starts from within the stone.
The Romans and the Hindus alike believe moonstones to have originated from moon light. The white moonstones especially, do remind one of moonlight. Some people believe moonstone to arouse the tender passion of lovers.
The moonstone is the 13th anniversary birthstone. It is also the June birthstone.
Moonstone Silver Faceted Ring
Moonstone Silver Faceted Ring

Sterling Silver Moonstone Orange/Grey Earrings
A gorgeous pair of highly polished/rhodium-plated sterling silver hood earrings with 2 oval orange/grey moonstones makes a terrific accessory. It's a gift she'll treasure.