SPINEL COLOR CHART
What's Synthetic Spinel?
Although not as widely used today as #Synthetic Corundum#, #synthetic Spinel# is still one of the most common man-made gem materials, particularly blue synthetic Spinel. It appears frequently in class rings and costume jewelry. Blue, green and other colors of synthetic Spinel are mostly manufactured using the inexpensive flame-fusion method by which the Spinel develops around an elongated boule. These flame-fusion Spinels can be distinguished from natural Spinels by a slightly elevated refractive index due to a chemical variation involving higher aluminum content.
Blue synthetic Spinels of the flame-fusion type are typically colored only by cobalt. No iron is added, and therefore they are diamagnetic, another property that distinguishes blue flame-fusion Spinels from blue natural Spinels. When viewed under the Chelsea filter and also under long wave UV light, the light blue and medium blue gems pictured below left and center show a pale pink reaction due to low cobalt content, while the dark blue gem on the right appears bright red due to much higher cobalt content. None of the synthetic Spinels shown below contain enough cobalt to cause magnetic attraction.
Blue Spinel gemstones manufactured by the slower and more costly flux-grown method have a vivid blue color due to high cobalt content. They are generally small in size, faceted from small synthetic crystals that are shaped like natural octahedral Spinel crystals, as opposed to the large rounded boule shapes of flame-fusion Spinels. Because the major chemistry is the same as natural Spinel, the refractive index range is also the same. While the common flame-fusion synthetic blue Spinels are almost always diamagnetic, flux-grown blue Spinels are weakly magnetic due to their higher cobalt content. This is the only gem material of any kind that we have found that shows magnetic attraction entirely as a result of cobalt. No iron or manganese can be detected.
Synthetic spinel is widely used because it is slightly softer than synthetic corundum, it can be fashioned more rapidly and less expensively. Secondly, several of the colors in which it is made are better imitation for a number of natural stones than those made in synthetic corundum
CHEMICAL PROPERTIES: Al2O3
HARDNESS: 8.5 Moh’s Scale
DENSITY: 3.98 – 4.1 g/cm3
MANUFACTURING PROCESS: Verneuil / Flame Fusion
Corundum and Spinel colors-6mm Round stones:
Corundum and Spinel colors Sample Box for sale:6mm Round stones : $30/pc
The available colors:
107# 108# colors are the simulated colors of Topaz Sky blue, Swiss bleu.
#120 is the simulated color of Topaz London Blue.
#112, #113,#114 are the simulated color of Sapphire blue.
#149(Light) and #152(Dark) are the simulated color of Tourmaline Green Color stones.
Slide Show of the Spinel Color chart 6mm round stones:
Google Album of the Spinel Color chart 6mm round stones Link:
Contact us for the further information if you have questions.