Sphene (titanite) is one of the main ore minerals containing titanium. Samples of gem quality are very rare and can be compared with diamonds in the play of light. The mineral was named for the characteristic shape of the crystals, because from ancient greek “sphenos” means “wedge”. The second common name for this stone is titanite. The mineral is found in the form of single flattened crystals of a wedge-shaped shape and twin splices. Occasionally forms needle and granular aggregates. It is transparent or translucent. It also has a high birefringence of light.
Peridot is a gem variety of the olivine mineral. The meaning of the word “peridot” may have originally come from the arabic “faridat” – a gem. The name “olivine” was given from the latin “olive” – an olive whose color resembles the color of this mineral. In nature that mineral is usually found in the form of grains, less often in the form of crystals.
Opal is one of the most beautiful gemstones. Its structure consists of the smallest spheres of silica (globules) and water between them. These gems are distinguished from the rest by a remarkable unique optical effect – opalescence. The transmitted light is divided into colored rays, as a result of which we observe an interesting play-of-color. Optical properties allow to observe different pure colors in the form of bright spots that can change their color depending on the angle of view and lighting in one sample. The color of opalescence depends on the size of the silica globules. With a size of about 0.1 microns, violet colors are obtained, with a size of 0.2 microns – red. The sizes between these values of the globules give all the remaining colors of the rainbow.
Spessartine is a type of garnet that is much less common than others. It is named after its find in the Spessart Mountains in northwestern Bavaria, Germany. It was first described in 1832. The size of the crystals of the gem grade mineral is insignificant, and faceted specimens weighing more than 5 carats are considered rare. Good quality spessartines are much higher than red garnets.
Zircon is a gemstone with a wide color range. A blue variety is sometimes called starlit, it is the most valuable. Such stones in color can resemble expensive Paraiba tourmalines. Another highly valued type has orange, brown or red color. Gem-quality zircons have unique optical properties, a strong birefringence effect and excellent dispersion, thanks to which a gemstone looks bright and memorable. They also come white, green, yellow, purple, and even with the phenomenon of color change.
Garnets are a group of minerals with the same structure, but different chemical composition. Properties of the stone may also have differences due to its composition. For example, we can observe the various color of the mineral: red, orange, yellow, brown, green, yellowish green, pink, colorless, black and also with the color change effect. The name of the mineral comes from the latin “granatum” – the fruit of pomegranate, due to the similarity of the shape and the color of crystals with fruit grains. It is worth noting the physical properties of the stone: in addition to the variety of colors, its high hardness, excellent luster and strong dispersion.
Heliodor is a famous gemstone, a type of beryl mineral group. The name comes from the Greek “helios” – the sun and “doron” – a gift. The color may be yellow, greenish, golden, or orange. Sometimes there are specimens with polychrome colors. Crystals usually have a columnar habit. The presence of good clarity even in large samples is a winning feature of this mineral. Sometimes it may contain gas-liquid inclusions and channels.
Mineral spodumene occurs in the form of beautiful prismatic crystals, the length of which can exceed 10 cm. The name of the mineral comes from the Greek «spodumenos», that means converted to ash, which is associated with its property: the stone forms a mass of ashen color when heated by a soldering tube. Kunzite, gem-quality variety of spodumene, owes its name to the famous mineralogist and gemologist at Tiffany & Co, George F. Kunz, who described this mineral in 1902.
Paraiba is the most expensive and valuable variety of tourmaline. The best specimens in terms of cost can compete even with diamonds because of its rarity and beauty. This tourmaline got its name in honor of the brazilian Paraiba state where the first finds were made in 1988.
Rubellite is a commercial variety of tourmaline mineral. It’s pink to red color. Most often referred to elbaite in composition. It got its name due to its color. The latin word “rubellus” has the meaning “reddish”.
The rubellite color palette contains various shades of red, including pink, raspberry, purple and fuchsia.
Tourmaline is a gemstone with amazing properties. This gemstone in its diversity of colors surpasses any other gem. The stone got its name in Europe at the beginning of the 18th century, when Dutch sailors began to bring various gems from Ceylon island (Sri Lanka) and among them – golden columnar crystals, which the inhabitants of the island called “turamali” or “turmali”. Mineral crystals are often represented by prisms with longitudinal shading. The cross section of the crystals usually looks like a spherical triangle. The hardness is quite high (7-7.5), it can be safely used in jewelry. Tourmalines today include a whole group of minerals with a common crystalline structure, but with differences in chemical composition.
Tsavorite is a grossular in its composition, a variety of garnet mineral. This rare gemstone was first found less than half a century ago. It got its name in honor of the find – Tsavo National Park in Kenya. This beautiful grossular garnet is mined only in the countries of East Africa: Kenya, Tanzania and Madagascar. They are yellowish, green and bluish-green. Most tsavorites are dark in color, so bright specimens are most valued. The green color of this grossular is caused by the content of chromium and vanadium.
Demantoid is a gem variety of the andradite mineral, a specimen of the garnet group. This is a very rare and most expensive variety of garnet.
The color of this garnet is green, often with yellowish or brownish hues, rarely with a blue tint. The most valuable shade is vivid green without any hint of yellowness. Green color comes from the content of chromium and iron, titanium gives yellow shades.
It is enough to translate the name of rhodolite garnet to make an understanding of it. From the Greek “rhodolite” is translated as a pink stone. It is the most valuable among other red varieties of the mineral. The palette of the mineral is very attractive; pink, purple, and violet hues are characteristic of its color.
We will pay attention to the information about pyrope garnet in this article. It’s about description and characteristics, properties, significance and historical background of its use in jewelry.
Pyrope variety is the most popular and famous among all red garnets. Due to the characteristic red color, the mineral was called “pyropos”, which translates from greek as “similar to fire”. It resembles a ruby, and in many sources there are mentions using this more valuable gem. This definitely hides the hidden desire to give one stone after another, very similar, but more significant. Indeed, in terms of color characteristics, the best pyropes, which have a bright scarlet color and excellent clarity, are similar to dark saturated rubies. But on this their similarity is limited. In chemical composition and physical properties, these are completely different minerals.
From this article you will know what kind of garnet stone is almandine, what are its main characteristics and properties, how does it look. Also we will provide a description and interesting facts about this gem. Almandine (or almandite) is a type of garnet mineral that is quite common and finds It is widely used in jewelry. Presumably, the meaning of the word “almandine” is associated with Alabanda city in Asia, the intersection of trade routes where these type of gemstones was cut.
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