Ruby-Zoisite Gemstone Information

Ruby-zoisite is the natural combination of both ruby and zoisite crystals in a single specimen. It is also known as 'anyolite', a name derived from the Masai word for 'green' (anyoli). Other name variations include "ruby-in-zoisite" and "Tanganyika artstone". Ruby-zoisite was discovered at the Longido mining district in northeast Tanzania by Tom Blevins, an English prospector. To this day, Tanzania remains the only source for ruby-zoisite. Blevins had initially thought that he had found vast ruby deposits in 1949, but it later turned out to be a green zoisite matrix with large inclusions of mostly opaque ruby. Ruby-zoisite is also heavily included with black hornblende minerals.

Depending on its primary constituents, ruby-in-zoisite can vary tremendously in color, pattern and hardness. Zoisite provides an earthy green color, while ruby inclusions give it pink and red highlights. Zoisite's hardness ranges from 6.5 to 7 on the Mohs scale, whereas ruby has a hardness of 9. Although ruby-zoisite is not fine ruby, it eventually found a purpose in carvings and cabochons. Today, it is one of the most colorful ornamental gemstones available, and the abundance of gemstone material makes it very affordable even in larger sizes.

Identifying Ruby-Zoisite Ruby-Zoisite Origin Buying Ruby-Zoisite Ruby-Zoisite Gemological Properties Ruby-Zoisite; Related Gems Ruby-Zoisite Mythology Ruby-Zoisite Jewelry Ruby-Zoisite Gemstone Care

Ruby-Zoisite Click to enlarge

Ruby-zoisite was first discovered in 1954 in the Longido mining district of Tanzania. To this day, it is still the world's only source for ruby-in-zoisite.

Ruby-Zoisite Color

Ruby-zoisite typically exhibits three different colors: green, black and pink to red. The green is owed to its zoisite composition; pink and red hues are owed to the presence of ruby (corundum) and hornblende is the cause of its black colors. Cutters will generally try to achieve more red colors by maximizing ruby portions, but in many cases, gem materials are cut to simply show the most attractive color contrasts.

Ruby-Zoisite Clarity and Luster

Owing to the large presence of inclusions, ruby-zoisite is an opaque stone. When polished, top-grade material exhibits a vitreous luster.

Ruby-Zoisite Cut and Shape

Ruby-zoisite is typically cut en cabochon. Large stones are rather affordable. Ruby-zoisite is also very popular as an ornamental stone, which is often carved into animals and other ornate decorative objects. On rare occasion, fine materials may be faceted. Tumbled and drilled ruby-zoisite beads are quite popular. Large oval shapes are most popular.

Ruby-Zoisite Treatment

Ruby-zoisite is not known to be treated or enhanced in any way.

Please refer to our Gemstone Glossary for details of gemology-related terms.

Ruby Cabochon

Ruby-zoisite is mixture of zoisite, corundum and hornblende. The gemstone varieties of zoisite, include violet-blue tanzanite and thulite, an opaque pink zoisite.

Ruby-zoisite is a gemstone which combines the properties of hornblende, ruby and zoisite. Rubies are symbolic of fire, while zoisite is an earthly crystal. Thus, ruby-in-zoisite is an ideal gemstone for balancing the fire and earth elements and energies. Ruby-zoisite is thought to enhance psychic ability and spirituality. It is sometimes used to help deal with issues related to patience and mood-swings. Physically, ruby-in-zoisite is thought to be helpful for healing bacterial infections. It is also used to help enhance fertility for both men and women. Ruby-zoisite is associated with the crown and heart chakras. It is also used as an astrological gemstone for both the signs of Aries and Aquarius.

Ruby-zoisite has a hardness of 6.5 to 7 on the Mohs scale, and is thus moderately hard and suitable for most types of jewelry. It is a popular ornamental material that is often carved into figures such as birds and other animals. Large cabochons are available, which are ideal for use as pendants. Rings are also suitable for ruby-zoisite, but care should be taken while wearing them.

Note: Buy colored gemstones by size and not by carat weight. Colored stones vary in size-to-weight ratio. Some stones are larger and others are smaller than diamonds by weight in comparison.

Ruby-zoisite exhibits perfect cleavage, so gemstones and jewellery should be protected from hard knocks or blows that can cause stones to split and fracture. It is a relatively hard material, but it is still much softer than many other 'more popular' jewelry gemstones, including sapphire, spinel and topaz. Avoid prolonged exposure to strong heat, direct light or sudden temperature changes. Ruby-zoisite should not be exposed to acid, bleach or other harsh chemicals and cleaners. Avoid the use of ultrasonic and steam cleaners. The best way to clean ruby-zoisite is by using plain soapy water and a soft cloth. Be sure to rinse well to remove any soapy residue.

Always remove ruby-zoisite gemstones before exercising, playing sports or when engaging in vigorous household chores such as dishwashing. Store ruby-zoisite away from other gemstones to avoid scratches. It is best to wrap stones using a soft cloth or place them inside a fabric-lined jewelry box.