Pulled Czochralski Yellow Sapphire

Pulled Czochralski Yellow Sapphire

Pulled Czochralski yellow sapphires are special gemstones created through a short process with two or more minerals. Yellow sapphires occur naturally but all Czochralski gemstones are man-made.
Gems created through this process have a high Mohs’ rating, average refractive index, and are poor conductors of electricity.

There are over four (4) different methods to synthesize sapphires in a lab, but many jewelers prefer pulled Czochralski yellow sapphires. Gemstones created with the Czochralski process look more natural and share identical properties with naturally occurring sapphires.

The superior qualities Czochralski sapphires possess make them ideal options for luxury jewelers and shoppers of loose gemstones. These sapphires can feature on necklaces, earrings, wedding bands, and other jewelry pieces.

There’s so much more about pulled yellow sapphires you need to know, especially if you plan to own these gemstones.

That’s why this article provides vital information about pulled yellow sapphires, their history, and everything else to give you all the details you need to choose the perfect gemstone.

History of Pulled Czochralski Yellow Sapphire

The Pulled Czochralski method became popular between the 18th and 19th century when demand for rubies and sapphires grew across Europe. Pulled sapphires became increasingly popular based on their superior features to gemstones created using other methods.

Over time, all available sapphire colors have received reworking through the Czochralski method. 20th century advancements in the pulled sapphire processes also made it easy to create high-quality gemstones with fewer resources.

How are Pulled Czochralski Yellow Sapphires Made?

Pulled Czochralski yellow sapphires form during a special process initiated by radio waves and aluminum oxide. The Czochralski process involves these steps:

• Radio waves melt aluminum oxide (Al2O3) in a special container,
• Dip a rod with a yellow sapphire crystal element at its tip into the aluminum oxide mixture,
• Slowly rotate and pull out the rod with its gemmed tip to form a ‘pulled’ column of sapphire

Pulled crystals made with the Czochralski method are superior to many other lab-created versions of sapphire. Lab-made yellow sapphires can also form through the floating zone method. The method involves the following steps:

• A sintered rod of powder elements for the gem culture receives intense heating with infrared in a vacuum,
• The rod is rotated to remove impurities and air while crystals form,

Jewelers prefer yellow sapphires created using the Czochralski method as these gemstones look more like natural crystals.

Uses of Pulled Czochralski Yellow Sapphire

Czochralski yellow sapphires are used as gemstones, fixtures on luxury glasswork, and much more. Sapphires are mostly ideal for decorative purposes as they don’t possess properties to be useful for more purposes.

Chemical Properties of Pulled Czochralski Yellow Sapphire

• Hardness (Mohs’ Scale): 9
• Chemical Formula: Al2O3
• Refractive Index: 1.76 – 1.77
• Luster: Vitreous
• Heat Resistance: 250°C to 340°C
• Fracture: Conchoidal
• Specific Gravity: 1.69 g/cm3

Maintenance Tips for Pulled Czochralski Yellow Sapphire

You can maintain pulled Czochralski yellow sapphires with:

A steam cleaner – light blasts of steam and shining with a dry piece of cloth or soft toilet paper

Jewelry cleaning solution – spray onto the gemstone and clean off with a dry piece of soft cotton cloth