Amber

Blue Chalcedony is a highly prized gemstone. The blue variety of Chalcedony occurs only when it does not contain many color-changing impurities. This stone is perfect for carving, cutting, crafting, and tumbling, and its rarity may explain why so many Chalcedonies are artificially colored for the market. The most valuable natural specimens of blue Chalcedony bend the light in such a way that they appear to be lit from within.

Emerald is one of the most well-known gemstones and commonly used for jewelry and other ornamental decoration. Emerald is graded on a scale of hue, tonal grade, and saturation. In general, a high-grade emerald will be medium to very dark in coloring. Most marketed gemstones are Colombian and have a blue-green color.

Blue Aventurine is the trade name for a natural stone that's often used in kitchens — including countertops, backsplashes, and other surfaces — as well as for tumbled stones. It makes a great substitute for marble and is said to be more durable. Blue Aventurine comes primarily from Brazil, though it can also be found in Russia and India.

Diorite rock has a contrasting mix of black and white mineral grains. The most famous diorite sculpture is the Code of Hammurabi, a black pillar inscribed with Babylonian laws. Diorite accepts a bright polish and can be attractive as a gemstone. It is used in the construction of roads and buildings and is cut and polished for building facings.

Not to be confused with other onyx-colored gems, black Tourmaline is packed full of useful elements, making it so much more than a pretty rock. Although it is high in lithium, aluminum, and iron, it is still most commonly used as a semi-precious gemstone and isn't mined for industrial purposes.

Chrysocolla is a beautiful, highly prized gemstone often used in silversmithing and goldsmithing. It is generally blue-green in color and similar to turquoise, but it's more widely available and relatively easy to work and shape. This mineral is frequently intergrown with other minerals such as Quartz, Chalcedony, and Opal, and is found in copper deposits.

A copper carbonate hydroxide mineral, malachite is well-known for its distinctive green shading, which renders it an attractive carving material. It has been mined in modern-day Great Britain and Israel for over three thousand years. Until 1800, it was used as a pigment in green paints.

Shungite, originally coined in 1879, referred to a black, lustrous mineraloid with more than 98% carbon. In recent times, the term has expanded to include a metamorphosed Precambrian algal-derived oil shale or sapropelite containing more than 5% carbon. These two forms of shungite are primarily found in the Karelia region of Russia. Shungite with over 98% carbon, also known as Elite Noble shungite, makes up less than 1% of the shungite bounty, standing out with its remarkably shiny and smooth surface, deviating from the usual rough texture observed in other shungite.