DEMANTOID GARNET – Vivid Green Crystals on matrix, Belqeys Mt., Iran

A Vivid Green Cluster from Belqeys Mountain

This is a striking specimen of Demantoid, the prized emerald-green gem variety of the garnet species Andradite, collected from Belqeys Mountain in Takab County, West Azerbaijan Province, in remote northwestern Iran. The crystals forming this cluster display an intensely saturated green hue and a bright, glossy luster, with well-defined faces that catch and reflect light from every angle.

Crystal Form and Matrix

The Demantoid crystals show the dodecahedral to trapezohedral habit typical of the species, grouped together as a well-developed aggregate set directly on matrix rather than as an isolated crystal. The contrast between the dark, glassy green of the garnets and the paler host rock gives the piece strong visual impact and genuine display appeal.

A Rare and Recent Iranian Locality

Material from Belqeys Mountain is considered among the finest sources of Demantoid in the world, valued for crystals showing a purer, more saturated green than the yellowish-green tones typical of many other deposits. The locality only entered the international mineral market in the years following its discovery in the early 2010s, distinct from Iran's older, serpentinite-hosted Demantoid deposits in Kerman Province to the south. Mining at Belqeys has remained a small-scale, artisanal operation ever since, keeping well-crystallized specimens relatively scarce.

A Compact, Rewarding Specimen

Measuring 47 x 43 x 22 mm and weighing 30 g, this thumbnail-to-small-cabinet specimen combines mineralogical interest with genuine aesthetic reward, equally suited to a systematic garnet collection or to anyone captivated by the brilliance of fine green Demantoid crystals on matrix.

What Gives Demantoid Its Green Color

Demantoid is the gem-quality green variety of Andradite, a calcium-iron garnet within the nesosilicate class of the garnet supergroup. Its vivid green color is caused specifically by trace chromium (Cr3+) substituting into the crystal structure in place of iron; the ferric iron (Fe3+) otherwise typical of Andradite tends to impart yellowish tones, so a higher ratio of chromium to iron produces the purer, more emerald-like green seen in this specimen.

Crystal Structure and an Unexpected Property

Demantoid crystallizes in the cubic system, typically developing dodecahedral to trapezohedral crystal faces that produce the bright, reflective surfaces visible here. Few collectors expect it, but Demantoid's iron content also gives it an unusually strong magnetic response for a transparent gemstone, and its optical dispersion is famously higher than that of diamond, producing flashes of "fire" when light passes through well-formed faces.

Formation at Belqeys Mountain

At this locality, the garnets grew within a metamorphic horizon of mica schists, quartzites, and marble interlayered with serpentinized ophiolitic rock, a skarn-type setting distinct from the serpentinite-hosted Demantoid deposits of Iran's Kerman Province further south. This chromium-bearing metamorphic environment favored the growth of well-formed, gemmy crystals. The deposit has been worked only since its discovery in the early 2010s and remains a limited, small-scale source of fine specimens.

• Formula: Ca3Fe2(SiO4)3
• Key chemical elements: Calcium, Iron, Silicon, Oxygen, with trace Chromium as the colouring agent
• Hardness (Mohs scale): 6.5–7
• Mineral class: Silicates (Nesosilicates, Garnet Group)
• Crystal system: Cubic (Isometric)
• Crystal habit: Dodecahedral to trapezohedral crystals, typically forming aggregates on matrix
• Formation: Metamorphic, in calcium-rich skarn-like horizons associated with serpentinised ultramafic rock
• Color: Intense emerald to grass green, caused by chromium substitution
• Locality status: Small-scale, artisanal mining, active since discovery in the early 2010s

A Name Born from Brilliance

Demantoid takes its name from an old Dutch/German word for diamond, a nod to its extraordinary optical dispersion, the flashes of "fire" produced when light splits into spectral colors, which actually exceeds that of diamond itself. The gem was first described from Russia's Ural Mountains in 1868, where it quickly became a favorite of jeweler Peter Carl Fabergé, who set vivid Russian Demantoids into many of his celebrated creations for the Russian imperial court.

Iran's Two Demantoid Stories

Iran actually has two separate Demantoid stories. The first began in Kerman Province in the country's southeast, where serpentinite-hosted Demantoid entered the market around 2001. Belqeys Mountain, in the remote northwest, is a much newer and entirely different find, its skarn-hosted garnets only reaching dealers and collectors after the deposit's discovery around 2013.

Mining at the Top of the World

Belqeys Mountain rises to roughly 3,296 meters, and its demanding terrain and remoteness have kept extraction small-scale and artisanal since the start. Despite these challenges, the locality has quickly earned recognition as one of the most important sources of true, chrome-rich green Demantoid found anywhere on Earth, rivaling the quality long associated with Russia's classic Ural deposits.

Meaning in Crystal Healing

Demantoid Garnet, the vivid green variety of Andradite, is traditionally associated with vitality, abundance and renewal. It is believed to encourage courage, passion and a positive outlook on life, while supporting prosperity and personal growth. Many traditions also connect garnets in general with strength, commitment and protective energy, qualities said to help one move through change with confidence and determination.

Color and Chakra Associations

The intense emerald-green color of this piece, formed on matrix from Belqeys Mountain in Iran, links it strongly to the Heart chakra, traditionally associated with love, compassion and emotional balance. This vivid green tone is also said to help release stagnant energy, inspire fresh beginnings and promote a renewed sense of connection and openness toward others.

These interpretations are not scientifically proven.

Chakra: Heart

Photos: All photographs are taken under professional lighting conditions to accurately highlight crystal structure, color and detail. However, slight variations in tone and appearance may occur depending on screen calibration and ambient lighting conditions.

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