What Gem Is Cobalt Blue?
Blue spinel.
Blue spinel gets it color from the impurity of cobalt in the crystal’s composition. These gemstones are commonly known as Cobalt Blue Spinel.
What is cobalt blue spinel?
Blue coloration in spinel is created by cobalt (Co2+) substituting for magnesium (Mg2+) in structure. Iron (Fe2+) is present and as the amount of iron increases, the saturation of blue decreases to blue-gray colors. Since iron is more common than cobalt as a coloring agent, vivid cobalt blue spinels are the rarest.
What gemstones contain cobalt?
Three other examples of cobalt contributing to color in natural gemstones are the rare green Sphalerite (diamagnetic), pink Cobalto Calcite (weakly magnetic due to iron), and pink Smithsonite (weakly magnetic due to manganese).
Is cobalt blue spinel valuable?
This rare color variety of the mineral mined in Vietnam, but it is extremely rare specimens over 1 carat. The cost of cobalt blue spinel starts from $2000-3000 and can exceed $10,000 per carat.
How do you identify cobalt blue spinel?
Cobalt shows slightly different absorption features on a spectrometer graph than does iron. High cobalt content also causes Spinel to appear bright pink under a Chelsea filter, or even bright red when the concentration of cobalt is high enough. Cobalt Spinels also fluoresce pink or red under long wave UV light.
Is cobalt blue real?
Cobalt Blue is a 2013 fictional drama novel by Indian film director, screenwriter and playwright Sachin Kundalkar.
Is lapis lazuli cobalt blue?
Lapis lazuli is a rock aggregate made up from – predominantly – the minerals lazurite, sodalite, nosalite and hauyne. It has a typical cobalt blue color, often with patches of pyrite (golden) and/ or calcite (white).
What color is close to cobalt blue?
ultramarine blue pigment
The closest color to cobalt blue is ultramarine blue pigment. The main difference between the two is that cobalt blue is a cool color, while the ultramarine color is warmer.
What type of crystal is cobalt?
Cobalt is the active center of a group of coenzymes called cobalamins. Vitamin B12, the best-known example of the type, is an essential vitamin for all animals.
| Cobalt | |
|---|---|
| Crystal structure | hexagonal close-packed (hcp) |
| Speed of sound thin rod | 4720 m/s (at 20 °C) |
| Thermal expansion | 13.0 µm/(m⋅K) (at 25 °C) |
Is cobalt present in Sapphire?
Sapphire is the impure form of alumina which contains cobalt (Co) as impurity.
What is the rarest blue gem?
Blue Spinel: The Rarest Blue Gem In The World
- Of all the gemstones in the world, there is only one that occurs in a natural shade of blue.
- Spinels come in a variety of shades, but the blue spinel gemstones are the ones receiving a heightened amount of popularity lately.
How much does cobalt blue spinel cost?
Note – Blue Spinel price per carat ranges from Rs 1,500 per carat ($25 approx.) and some auction quality pieces can grab a whopping price of Rs 50,000 per carat ($780 approx) and above in India.
Is cobalt blue still used?
It is extremely stable and historically has been used as a coloring agent in ceramics (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt.
Is spinel a valuable gem?
Top Spinels in the 2 to 5 carat size will often sell for $3,000 to $5,000 a carat. For the very rare stones over 5 carats, prices in the range of $8,000 to $10,000 per carat are not unusual for the top colors.
What is the most valuable color of spinel?
red spinel
Some spinel colors are more rare and valuable than others. In general, red spinel is the most desirable, followed by fine cobalt-blue spinel, then by vibrant hot pink and vivid orange stones. Violet and bluish purple to purple, or lavender, stones tend to be less attractive, and less in demand than other, rarer colors.
What does cobalt blue symbolize?
Meanings and History of Cobalt Blue
Cobalt blue color is soothing and peaceful. It can suggest richness. Like azure and other medium blues, its qualities include stability and calmness. Cobalt blue has a history of use in Chinese porcelain and other ceramics and in stained glass.
Is royal blue the same as cobalt blue?
Royal blue is a shade that has high intensity and brightness, and it is not serene or calming like sky blue shade. The shade that became famous as Royal blue was earlier referred to as Queen’s blue. Cobalt blue is a shade of color blue that is medium and bright. It is very bright and is used in ceramics and glassware.
Why do they call it cobalt blue?
The name “Cobalt blue” comes from Middle High German kobolt = an underground goblin (cobalt was thought to be detrimental to silver ores).
What is the other name of cobalt blue?
In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for cobalt-blue, like: cobalt ultramarine, peacock-blue, greenish blue, aqua, aquamarine and turquoise.
What Hex is cobalt blue?
#0047AB
Cobalt blue is a vivid, fairly light shade of blue with the hex code #0047AB, originally derived from combining cobalt oxide with aluminum.
Is blue lapis valuable?
Lapis lazuli is not an expensive stone, but truly fine material is still rare. Lower grades may sell for less than $1 per carat, while the superfine material may reach $100–150/ct. or more at retail.
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