An intriguing cabochon of Rainbow Moonstone, from India. Cut from hard-to-find rough, Romans named it so because they thought it was made of moonlight. It's actually orthoclase, like its closest relative, labradorite.
Watermelon tourmaline. Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors. The name comes from the Sinhalese word "Thuramali" or "Thoramalli", derived from different gemstones found in Sri Lanka. [Wikipedia]
Benitoite is a stunning blue coloured diamond-like precious stone that has, so far, only been discovered in the vicinity of the San Benito River, San Benito California (hence the stone’s name), Arkansas and Japan. Whilst breathtakingly beautiful and still somewhat rare.
Kimberlite pipe through limestone. Kimberlite pipes are the geologic source rock of the world,s commercial diamond production, They also contain other precious and semi-precious stones. Named after Kimberly South Africa,( where the geologic formations were first discovered in 1888).