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Gem Blog

Gem Blog

Delving into the Depths of the Earth

Step into the world of sapphire mining with us as we uncover the timeless tradition and dedication of the miners in Sri Lanka. In the heart of the mine, an elder miner, weathered by years of toil, delves into the depths, unearthing gem-bearing gravels from the underground. Surrounding him, a wooden structure stands tall, crafted […]

Discover the Radiance of Ceylon’s Natural Light Blue Sapphire

Nestled in the heart of Ratnapura, Sri Lanka, the gemstone capital of the world, lies a treasure of unparalleled beauty: the Ceylon Natural Light Blue Sapphire. This exquisite gemstone is a testament to the rich tapestry of nature’s artistry, and it’s now available for you to own from the esteemed Danu Group Gemstones Collections. A […]

Color Change Sapphire Gemstones: A Rare and Stunning Beauty

Sapphires are one of the most popular gemstones in the world, prized for their color, quality, rarity and durability. However, there is a rare and precious variety of sapphire that is even more special: color change sapphire. What are Color Change Sapphire Gemstones? Color change sapphire gemstones, as the name suggests, are sapphires that exhibit […]

Purple Sapphire – Calm colour in Corundum family

Purple sapphire is a very calm and natural attractive color gem variety in the Corundum family. It’s a very popular color variety among gem lovers because of its calm color. Now, The gem is used for engagement rings and other jewelry than in past decades. As a precious gem variety, It has good value in […]

Dunilite – Rare Olivine

Dunilite is a rare olivine group mineral with the corresponding chemical formula Magnesium, Iron, Manganese, Silicate (Mg,Fe,Mn)2SiO4. Long mistaken for green peridot, dunilite was identified in 2000 as a new gem variety from the olivine group. Dunilite- Discovered by Mr. Dunil Palitha Gunasekera in 1996. Dunilite occurs in only one locality called, “Katukubura mountain” Kolonne, […]

Serendibite – Still In Top 10 Extremely Rare List

Serendibite is named after “Serendib”, the old Arabic name for Sri Lanka, where the mineral was found. Serendibite can be found in colors such as pale yellow, blue-green, greyish blue, black. It can be found in Sri Lanka, USA, Canada, Madagascar, Tanzania, Russia, Myanmar. In Sri Lanka, Specially from Kurunegala, Ratnapura, Embilipitiya, Kolonna. • Chemical […]

Demantoid Garnet

Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Demantoid was discovered in Russia in the early 19th century. In 1854, the noted mineralogist Nils Gustaf Nordenskiöld identified this gem as a variety of andradite garnet. As a rare gem variety, demontoid garnet is highly prized […]

Bi Colour Zircon Sri Lanka

One of the amazing gemstone family known as “zircon”. Zircon has amazing colour varieties with it’s own unique characteristics. There is a zircons what i found from danu group minings Color : Bi Colour ( Light Olive Green & Orangy-Yellow ) Shape : Alluvial broken Half Crystal Clarity : Slightly Included Treatment : Unheated Height […]

Negative Crystal Inclusion In Natural Spinel – Danu Group Inclusions Gallery

This is very nice natural violetish grey spinel from city of gem Ratnapura, Sri Lanka. When we found the Rough stone from the the direct source, we didn’t catch the nice negative crystal inclusion in this spinel. This nice negative crystal can be seen centre of the stone under the table. Visit Danu Group Website […]


Sillimanite is an aluminosilicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman (1779–1864). It was first described in 1824 for an occurrence in Chester, Middlesex County, Connecticut, US. It’s well known to gem collectors and highly prized because of its great scarcity. It is Orthorhombic crystal system mineral […]