ALEXANDRITE

Weight: 11.90Carat

Size: 13.5 x 13.2 mm

Color: Color Change Blue Green to Raspberry Purple 

Shape/Cut: Oval

Treatment: Czochralski

Clarity: VVS

Quantity: 1 Piece(s)

Ref ID: JE16

About this Gem:

The Czochralski method is versatile and can be applied to various materials, including silicon, germanium, gallium arsenide, and other semiconductors. It's a critical process in the semiconductor industry for producing large, high-quality single crystals used in the manufacturing of integrated circuits.

In the context of gemstones, synthetic crystals produced using the Czochralski method can mimic the properties of naturally occurring gemstones. These lab created alexandrite changes color just like the natural alexandrite, at much affordable prices.

Here's a simplified explanation of the Czochralski method:

Melting: A high-purity sample of the material to be crystallized (often a metal or semiconductor material) is placed in a crucible and melted.

Seeding: A small single crystal of the same material, known as a seed crystal, is dipped into the molten material. The seed crystal is attached to the end of a rod, known as a "seed crystal mount."

Crystal Growth: The seed crystal is slowly pulled upward and rotated. As it is withdrawn, the molten material solidifies to form a single crystal. The rate of pulling and rotation is carefully controlled to maintain the desired crystal structure.

Control and Cooling: The conditions of the process, such as temperature, pulling rate, and rotation speed, are carefully controlled to produce a single crystal with the desired properties. The environment is often controlled to avoid impurities.

The resulting single crystal can have superior properties compared to polycrystalline materials. The Czochralski method is particularly important in the production of silicon wafers used in the electronics industry, where the high purity and crystalline structure of the material are critical for semiconductor device performance.

In the context of gemstones, the Czochralski method is used to produce synthetic or lab-grown crystals, including gemstones like synthetic sapphires and rubies. The crystals produced using this method can be of high quality and have applications in both industrial and jewelry settings.

Chemical composition: BeAl2O4Hardness: 8.5Color: green in daylight and purplish red in incandescent light.Luster: vitreous to greasyTransparency: transparentFracture: conchoidal, brittleAlexandrite Index of refraction: 1.745 – 1.759

Molecular Weight = 126.97 gm