How Do You Identify A Cobalt Spinel?

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 spinel rare?

Vivid cobalt spinels are particularly rare and more expensive than the other blue spinels.

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.

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.

How do you identify spinels?

The proper way to analyze whether Spinel is real is to put it under a UV Radiation Light. Set it to long-wave and look for any stones that are particularly glowy. If the stones are glowy, that means it’s synthetic and not natural.

What is cobalt spinel?

One of the most prized varieties of Spinel, this Cobalt Blue Gem from Ceylon features the distinctive hue and coveted name on the report. Faceted as an oval, the Natural Cobalt Spinel displays great luster and clarity, and the rare size for this precious material two and a half carats.

Where is cobalt blue spinel found?

The leading source of cobalt-blue spinel is Vietnam’s Luc Yen District, known for its vibrant blue material, though those stones tend to be small.

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.

Is cobalt blue rare?

Even though cobalt blue glass has been made throughout the generations, the color is still rare, especially when compared with clear or brown glass.

What is cobalt aluminate blue spinel?

Cobalt Aluminate Blue Spinel, an inorganic pigment, is a reaction product of high temperature calcination in which Cobalt (II) Oxide, and Aluminum (III) Oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of spinel.

Is spinel worth now?

The value of spinel varies based upon its color, clarity, and rarity. The most valuable spinel is red spinel, as well as blue, orange, and pink. Its price per carat can be as low as $50, while exceptionally rare spinel costs a few thousand dollars to over $9,000 per carat.

What gem is cobalt blue?

spinels
Cobalt-colored spinels are particularly prized for their bright, intense blue colors. Synthetic spinels, common and inexpensive, are frequently used as simulants or imitations for many gems.

Which is more expensive spinel or sapphire?

As you can see, the Spinel is quite a bit larger than the Sapphire, and is considerably less expensive.

Does spinel glow under black light?

Fluorescence under UV rays: A Natural Spinel has the strongest fluorescence under a long wavelength and weak to absent under a short wavelength. While, Synthetic Spinels have strong fluorescence under a short wavelength and may often a bright blue, chalky green, or red fluorescence.

Do spinels sparkle?

The name “Spinel” comes from the Greek word for “spark”, referring to the gem’s distinctive sparkly shine. Just like sapphires, spinels can be found in red, green, blue, pink, purple, orange, brown, colorless and black.

How can you tell the difference between spinel and ruby?

A ruby is dichroic (meaning it shows different colours when viewed from different directions) whereas a spinel is singly refractive (it has only one refractive index – much like diamond and garnets), this property means that spinels general have vivid fire and colour, making it a wonderful stone to work with on

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 synthetic spinel valuable?

Furthermore, synthetic spinel is inexpensive and common. It has frequently been used as a simulant for other gems in class rings and birthstone jewelry, which has affected its public perception. Natural spinel, however, has always been a rare and beautiful gem.

Is blue spinel expensive?

Price for the Cobalt Blue Spinel from Vietnam can reach many thousand dollars per carat. However this perfect blue material is so rare and limited, the maximum size you can get is below one carat. Any well-cut gem above one carat and especially two carats is collectible and exclusive.

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.

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.