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Natural tourmaline gemstone jewellery
Derived from the ancient Sinhalese word toramalli, meaning ‘gemstone of mixed colours’, tourmaline is celebrated across the gemmological world as nature’s most endlessly versatile gem family. Formed as complex boron silicates, predominantly Elbaite, its vast spectrum ranges from deep forest greens to oceanic indigos, though green, pink, and red remain the most iconic and widely cherished colours for gem quality pieces. Exhibiting remarkable pleochroism, where a single gem displays subtle, shifting shades as it moves through the light, tourmaline captures a dynamic, living brilliance. Endowed with completely natural, earth born authenticity, it brings an expressive and contemporary sophistication to precious jewellery.
Colour spectrum
Green, pink, red, indigo
Pictured: Petite Quatrefoil Pink Tourmaline Necklace
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Na(Li1.5,Al1.5)Al6Si6O18
(BO3)3(OH)4
Elbaite · Trigonal crystal
Complex sodium lithium aluminium boron silicate, Na(Li1.5,Al1.5)Al6Si6O18(BO3)3(OH)4, crystallising in the trigonal system as distinctive, striated three sided prisms within lithium rich pegmatites. Valued for its rich vitreous lustre, strong pleochroism (dichroism), and unique pyroelectric properties, allowing the crystal to generate a subtle surface charge when subjected to thermal changes.
7 to 7.5
on the Mohs scale
Rating an impressive 7 to 7.5 on the Mohs Hardness Scale, tourmaline possesses excellent scratch resistance and solid structural integrity. With no prominent directional cleavage, it effortlessly withstands daily wear, making it an enduring and reliable choice for modern fine jewellery crafted to last across generations.
Formed deep within pegmatitic pockets under severe geological temperature and pressure, natural tourmaline derives its vivid spectrum from trace transition elements incorporated during growth: manganese yielding delicate blush to deep raspberry pink, iron producing rich verdelite greens and oceanic blues, and natural subterranean irradiation fixing its warm hues. Each gemstone exhibits strong optical dichroism, revealing two distinct tones depending on the angle of view without artificial dyes or surface coatings.
| Feature | Green Tourmaline | Chrome Diopside |
|---|---|---|
| Colour Palette | Rich forest green, deep verdelite olive, soft mint, and subtle yellowish green to bluish green tones. | Intense emerald green, fiery forest green, electric chromium green, and deep pine green hues. |
| Mohs Hardness | 7 to 7.5 / 10Exceptional scratch resistance with no directional cleavage, offering enduring structural toughness for any fine jewellery creation. | 5.5 to 6.0 / 10Possesses distinct prismatic cleavage; best suited for pendants, earrings, and protected ring settings. |
| Refractive Index (Lustre) | 1.62 to 1.65Vitreous lustre delivering rich, double refractive clarity and dynamic dichroic brilliance. | 1.67 to 1.70Vitreous to subadamantine lustre with high optical density, yielding an exceptional, fire filled sparkle. |
| Chromophore | Trace Iron (II) ions or Titanium charge transfer, producing deep forest to subtle mint tones. | Trace Chromium (III) ions: the exact same colouring agent responsible for fine emeralds and tsavorite garnets. |
| Ugems co. Positioning | In Design at UgemsCherished for its exceptional structural durability and rich, olive to forest botanical hues: a signature choice for enduring, fine jewellery creations. | In Design at UgemsAdored for its pure, electric green saturation, bringing an extraordinary radiant burst of colour to refined and delicate settings. |
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