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Category: Practical Gemology

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 […]

Sunset Padparadscha with Green Sapphire

Nice colors are a big dream when we work with gemstones. There is an unheated green sapphire and padparadscha sapphire from Sri Lanka and Madagascar. Dreams never end. When I saw both stones in the lot, I imagined. Beautiful sunset through the green forest Yellow Sapphire and Pink Sapphire can be seen in the market […]

Bi-color Sapphire – Wedding Stone

Yellow and blue colors are very interesting colors in the Sapphire family. Yellow Sapphire is yellow color variety of corundum Family and called as “pushparaga“. The names derived from Sinhalese Sanskrit word. Blue Sapphire is also a very valuable and popular stone in the corundum family. When Both colors have in one stone separately, It’s […]

Zircon Heat Treatment Part (ii) – Traditional Oxireducing

We did zircon heat-treatment article before with traditional oxidising method. You can see that, We were able to get good yellow color from dark brownish purple zircon. In this time, We did oxireducing by using traditional method. That heating method has been using in Sri Lanka for 1000 years. Old businessmens say, their grand fathers […]


Fibrolite is an aluminosilicate mineral with the chemical formula Al2SiO5. Fibrolite is fibrous form the gemstone variety of sillimanite. Although fibrolite has priority over sillimanite, the two species were not ultimately recognized as the same species until about 1854 by James Dwight Dana. Named in 1802 by Jacques Louis Comte de Bournon because of its fibrous habit. It is an Orthorhombic […]


Sulfur is a chemical element with an atomic number of 16 and an atomic symbol of S. At room temperature, it is a yellow crystalline solid. Even though it is insoluble in water, it is one of the most versatile elements of forming compounds. Jupiter’s moon has over 400 active volcanoes that emit enormous amounts […]


Goshenite is a colorless variety of mineral beryl. This is 9.60 Cts Goshenite from Sri Lanka. When we check the stone by Microscope, We could see special Inclusion called “Three-phase Inclusion”. It has one colorless gas bubble and tiny black crystal in rectangular inclusion. Beryl is a mineral composed of beryllium aluminum cyclosilicate with the […]

Chrysoberyl Cats Eye

Chrysoberyl cat’s eye is a gemstone variety of beryllium aluminum oxide which exhibits optical effect known as ‘chatoyancy’ that contains large numbers of fibrous inclusions can produce a ” Chatoyant ” a line of light across the surface of the stone that orients perpendicular to the included fibers. that resembles the slit eye of a […]

Natural Zircon Heating Process

Zircon is a nesosilicates group mineral. Its corresponding chemical formula is ZrSiO4. The name derives from the Persian zargun, meaning “gold-hued”. Zircon is a popular gemstone that has been used for nearly 2000 years. The crystal structure of zircon is tetragonal crystal system with 7.5 hardness according to the Mohs Hardness scale. Zircon is also very resistant to heat and corrosion […]

Extremely Rare Gemstone – Natural Grandidierite

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 […]