Project Description

TOURMALINE

loose tourmaline available to purchase

Tourmaline is the birthstone for October, the gem for the 10th anniversary.

Tourmaline is believed to help relieve stress, increase alertness, stimulate circulation, and boost the immune system.  It is good for keeping the digestive system healthy, aiding detoxification and supporting weight loss, as well as strengthening teeth and bones.

It is also said to be helpful to artists, authors, actors and those in creative fields.

Tourmaline has with superior hardness (7 to 7.5 on the Mohs scale) has the widest range of colours apart from sapphire.

COLOUR

Tourmaline is available in every colour, from colourless to black. It can show every tone from pastel to dark, and can exhibit various colours in the same stone.  Intensity and saturation tend to be the most important factors.

One of tourmaline’s most sought-after and rarest colours is the pink/red variety known in the trade as rubellite.  The more common darker olive tourmalines are much lower in price than fine green tourmaline or brighter bluish green tourmaline which at their best are transparent, brilliant, and clean.  Every shade between green and blue exist from the green with a slight hint of blue to a blue with a slight hint of green to the true blue.  Like green tourmaline the blue colours can be dark to light and strong and vivid or less saturated and grayish. Yellows and purples are more rare.

Paraíba tourmalines in neon blues and greens with their more attractive hues, higher colour saturation, and greater rarity are the most expensive of tourmalines.

CLARITY

Tourmaline is typically transparent to translucent. Tourmaline is often included. The level of inclusions can vary depending on the type of tourmaline, with some colours being more heavily included than others. Green tourmaline is often eye-clean, while blue, red and pink tourmaline, including rubellite, paraiba and watermelon tourmaline, are almost always found with significant inclusions. Cat’s eye tourmaline is usually translucent to opaque and owes its chatoyancy to thin needle-like inclusions.

CUT

Tourmalines come in all shapes and sizes. It is often cut into long rectangular bar shapes because of its elongated crystal habit. However, tourmaline is also available in various traditional and fancy shapes and a range of cutting styles.

Tourmaline is strongly pleochroic, which means that it can show different colors when viewed at different angles, one of which is usually much darker than the other. Also many tourmalines absorb more light down the length of the crystal than across it. So a crystal that appears pale green across its length can be very dark green—sometimes almost black—when you look down its length. Depending on the darkness are lightness 0f the rough tourmaline, cutters will orient the cut to achieve the most attractive hue.

Rare cat’s eye tourmaline is cut as a cabochon to best display the desirable cat’s eye chatoyancy. Watermelon tourmaline is often cut into slices to best exhibit its characteristic and attractive colour zoning.

PYROELECTRICTY

Many tourmaline crystals exhibit polarity – the colour, electrical properties and the crystal forms are different at either end of the crystal. These variations arise because of the complex structure and chemistry of the stone. When heated or rubbed, it acquires an electric charge and attracts small objects like dust and other lightweight objects. This property, known as “pyroelectricity is why tourmaline is used in electrical devices to produce pressure gauges.

Use warm soapy water and a soft cloth to clean your tourmaline jewellery.  Be sure to rinse well to remove all soapy residue.  As with most other gemstones, the use of ultrasonic cleaners and steam cleaners are not recommended.

Tourmaline is generally stable to light and isn’t affected by exposure to chemicals. Some tourmalines might have been treated to improve their colour. The two most important tourmaline treatments are heating and irradiation. Colour changes due to irradiation may fade with sustained exposure bright light or heat. High heat may alter the colour of tourmaline, and sudden temperature change (thermal shock) can cause fracturing.

Tourmaline can scratch other gems and also be easily scratched by harder gems such as sapphire and spinel so always store tourmaline jewellery separately.

tourmaline jewellery available to purchase