Ceylon Natural Spinel with amazing blue colour - Danu Group Blue Spinel Collection

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Rough & Crystals

Natural gemstones in their raw, uncut form.

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Natural Chrysoberyl Crystal Sri Lanka
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Natural Chrysoberyl Crystal Sri Lanka
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5_Ceylon Natural Quartz Crystal with step marks - Danu Group Gemstones
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Ceylon Natural Quartz Crystal with Amazing Structure
Original price was: $700.00.Current price is: $559.00.
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6_ceylon Natural Sapphire Trigonal crystal from Danu Group Mining
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Ceylon Natural Sapphire Crystal
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9_rare chrysoberyl crystal danu group mining
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Rare Chrysoberyl Crystal
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6_rare chrysoberyl crystal danu group mining
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Rare Chrysoberyl Crystal
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Ceylon Sapphire fish crystal danu group A
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Ceylon Sapphire Fish Crystal
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11_ceylon Natural Sapphire Crystal - Danu Group Gemstones
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Ceylon Natural Sapphire Crystal
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Ceylon Natural Sapphire Rough Crystal
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Ceylon Natural White Sapphire Crystal
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NATURAL LIGHT PINK SPINEL OCTAHEDRON CRYSTAL SRI LANKA
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Natural Light Pink Spinel Octahedron Crystal Sri Lanka
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Natural Purplish-Pink Spinel Sri Lanka
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Natural Purplish-Pink Spinel Crystal Sri Lanka
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Red Spinel Crystal from Vietnam
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Red Spinel Crystal from Vietnam
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Pargasite and Pink Spinel Crystals on Calcite Marble 韭角閃石 、粉紅尖晶石、方解石大理石上共生 Spinel is the magnesium aluminium member of the larger spinel group of minerals with chemical formula MgAl₂O₄ This oxide mineral is Cubic crystal system with 7.5–8.0 hardness according to Mohs hardness scale. Spinels Specific Gravity is depending on the composition of chemicals such as Zn-rich spinel can be as high as 4.40, otherwise it averages from 3.58 to 3.61. Spinel has many colours such as red, pink, blue, lavender/violet, dark green, brown, black, colourless, gray. Some red and pink spinels have fluorescence under UV Light. also, Some spinels have magnetism Weak to medium. Spinels are found in Madagascar, Sri Lanka, Vietnam, Myanmar, Tanzania, Kenya, Nigeria. Pargasite is a complex inosilicate mineral of the amphibole group with formula NaCa₂O₂₂(OH)₂. This inosilicates mineral has 5 - 6 hardness according to the Mohs Hardness scale with 3.04–3.17 Specific Gravity. This bi axial mineral has colours such as Bluish green, grayish black, light brown, Green. It was first described for an occurrence in Pargas, Finland in 1814 and named for the locality. Pargasites are found in Pinland, Vietnam, Madagascar, Tanzania, India, Pakistan, Afghanistan, Mozambique, Hungary, Japan, Bulgaria, Cameroon. Descriptions Weight : 58.90 Cts Locality : Vietnam 🇻🇳
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Pargasite and Pink Spinel Crystals on Calcite Marble
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Rare Natural Colour Change Cobalt Spinel Crystal
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Rare Natural Colour Change Cobalt Spinel Crystal
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Ceylon Natural Violet Sapphire Crystal
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Ceylon Natural Violet Sapphire Crystal
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Natural Pink Spinel Crystal Specimen Weight : 113.30 Cts Fluorescence : Very good Fluorescence under UV light Treatment : None/ NaturalNatural Pink Spinel Crystal Specimen Weight : 113.30 Cts Fluorescence : Very good Fluorescence under UV light Treatment : None/ Natural
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Natural Pink Spinel Crystal Specimen
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Extremely Rare Gemstone - Natural Grandidierite Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. Grandidierite is nesosilicates mineral with the chemical formula (Mg, Fe2+)(Al, Fe3+)3(SiO4)(BO3)O2.                                                                  It is found colors such as Bluish-green, greenish-blue with 7½ hardness according to the more hardness scale. Grandidierite can be seen Vitreous, Pearly luster stones with 2.98 - 2.99 Specific Gravity. This gemstone was named in honor of French explorer Alfred Grandidier who studied the natural history of Madagascar. He is a French explorer and Naturalist. Grandidierite has very strong dispersion and Visible Pleochroism, It is a Nesosilicates orthorhombic Mineral with Biaxial (-) Optical Properties. Inside of grandidierite mostly can be seen very perfect cleavages. As an optical properties, it has a 1.583 - 1.639 refractive index. Grandidierite can be found in India, Germany, Denmark, Malawi, Namibia, India, Norway, and Sri Lanka. Grandidierite's main source is Madagascar. Healing Properties of Grandidierite Grandidierite is a blue gemstone that promotes spiritual awakening, peace, and tranquility and can encourage you to communicate in a calm and clear manner.
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Natural Grandidierite Specimen
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Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. Optical properties: Biaxial (-) Category: Nesosilicate Formula: (Mg,Fe2+)Al3(BO3)(SiO4)O2 Crystal system: Orthorhombic Color: Bluish green Dispersion: strong Hardness: 7 to 7.5 Refractive Index: 1.590 to 1.623 Grandidierite have been found in only a few locations around the world, including Malawi, Namibia and Sri Lanka and few gem quality specimens have come mainly from Madagascar.
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Rare Grandidierite Specimen
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Natural Ruby specimen 318.80Cts weight, 51mm x 21mm x 30mm dimension stone A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum. Other varieties of gem-quality corundum are called sapphires. Category: Oxide mineral variety Formula: aluminium oxide withchromium, Al2O3:Cr Crystal system: Trigonal Crystal class: Hexagonal Mohs scale: hardness9.0 Luster: Subadamantine, vitreous, pearly Specific gravity: 3.97 – 4.05 Optical properties: Uniaxial - Refractive index: nω=1.768–1.772 nε=1.760–1.763 Ruby is a powerful stone to shield against negative energy, psychic attack, and energy vampirism, especially of the heart energy.Ruby is a stone of Divine creativity. It boosts your energy levels and promotes high self-esteem, intuition, and spiritual wisdom. According to astrology generally ruby should be worn in ring finger of right hand. Ruby is one of the most popular gemstones, and is used extensively in Jewelry. Ruby is used in all forms of jewelry, including bracelets, necklaces, rings, and earrings.
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Natural Ruby Specimen
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" Grandidierite " Rare mineral Specimen, Weight : 400g Mineral : Madagascar C/F -: (Mg,Fe2+)Al3(BO3)(SiO4)O2 This is Orthorhombic crystal system, Nesosilicate mineral from Madagascar
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"Grandidierite " The World Extremely Rare mineral Specimen Museum Piece
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Beauty Of nature Creation, Ceylon Natural Black Spinel With special earth creation " Trigon Δ " Mark https://youtu.be/34Blovp2XOg https://danugroup.lk Spinel is the magnesium aluminium member of the larger spinel group of minerals. It has the formula MgAl₂O₄ in the cubic crystal system. Its name comes from Latin "spina" Spinel helps to release stress and worry whilst replenishing depleted energy.
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Ceylon Natural Black Spinel With special earth creation "Trigon" 
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About Rough & Crystal Gemstones

Our rough and crystal gemstones are 100% natural, sourced directly from trusted mining regions. These stones are not cut or polished, allowing their natural structure and character to remain intact.

Key features include:

  • Natural uncut & untreated gemstones

  • Visible crystal formations and natural surfaces

  • Suitable for collecting, cutting, display, or spiritual use

  • Each piece is unique in shape and texture

Available varieties may include sapphire, ruby, spinel, quartz, zircon, tourmaline, and other natural minerals.

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