Sapphires are precious gemstones that belong to the corundum mineral family. They are a form of aluminium oxide (Al2O3) with a trigonal crystal structure and a hardness of 9 on the Mohs scale. Known to be the hardest minerals on earth, second only to diamond, sapphires can be found in a variety of colors, including blue, pink, yellow, green, purple, and colorless. Each gemstone holds its own unique significance in Vedic and Western astrology according to its color.

However, it is ethically critical for a dealer, to show the treatment done on the gemstones through trading. The type of heat remedy accomplished depends on the excellent and place of the gemstones.

Heat remedy may be the therapy typically completed on Yellow Sapphire to increase their color. Almost 60%-70% of the yellow sapphires sold in the market are heat-treated. Even on close inspection of the gem lots of remedies are challenging to find.

Yellow Sapphire Treatments

Natural yellow sapphires, like many gemstones, often undergo treatments to enhance their color and clarity. These treatments are widely accepted in the gemstone industry, and when performed ethically, they can improve the overall quality of the gem without compromising its authenticity. The most common treatments applied to yellow sapphires include:

  1. Heat Treatment :
  • Purpose: Enhances color and removes undesirable inclusions.
  • Process : Yellow sapphires are treated with beryllium-rich compounds, resulting in a wider range of color options.
  • Identification : Heat-treated sapphires are prevalent in the market, and gemologists use various tools to detect residual heat effects.
  1. Beryllium Treatment :
  • Purpose : Introduces beryllium into the gemstone to alter its color.
  • Process : Yellow sapphires are treated with beryllium-rich compounds, resulting in a wider range of color options.
  • Identification : Sophisticated gemological techniques, such as spectroscopy, help identify traces of beryllium.
  1. Surface Coating :
  • Purpose : Enhances color or adds a different color to the surface of the gemstone.
  • Process : A thin layer of coating is applied to the gem’s surface.
  • Identification : Microscopic examination can reveal the presence of coatings, and certain solvents may remove them.

While these treatments are generally accepted, it is crucial for buyers to be aware of them and seek transparency from sellers. Ethical sellers disclose any treatments applied to their gemstones, ensuring informed purchasing decisions.

Synthetic Sapphire :

Advancements in technology have given rise to synthetic gemstones that closely mimic their natural counterparts. Synthetic yellow sapphires, created in laboratories, offer an affordable alternative to natural gems. Key points to understand about synthetic sapphires include:

  1. Manufacturing Process :
  • Synthetic yellow sapphires are typically created using the Verneuil process or the Czochralski method.
  • In the Verneuil process, fine powder is melted and then solidified to form a crystal, while the Czochralski method involves slowly pulling a crystal from a molten solution.
  1. Physical Properties :
  • Synthetic sapphires share the same chemical composition and physical properties as natural sapphires.
  • Gemologists use specialized instruments, such as spectroscopy and magnification, to identify synthetic gems.
  1. Inclusions :
  • While natural sapphires often contain inclusions, synthetic sapphires may lack such natural imperfections.
  • Examining the gem under a microscope can reveal clues about its origin.

How to Check if a Yellow Sapphire is Natural or synthetic :

  1. Color Consistency :
  • Natural yellow sapphires exhibit a range of shades and tones, often with slight variations.
  • Synthetic sapphires may display a more consistent and uniform color due to controlled manufacturing processes.
  1. Inclusions :
  • Natural yellow sapphires commonly contain inclusions, which can be seen under magnification.
  • Synthetic sapphires may lack these natural imperfections, appearing flawless.
  1. Fluorescence :
  • Natural sapphires may exhibit fluorescence under ultraviolet light.
  • Synthetic sapphires may show different fluorescence patterns, aiding in differentiation.
  1. Microscopic examination :
  • Examining the gem under a microscope can reveal telltale signs of synthetic manufacturing, such as growth lines or gas bubbles.

 

Yellow sapphire’s allure persists through the ages, but in today’s market, distinguishing between natural and synthetic gems is essential. Understanding common treatments applied to yellow sapphires, recognizing synthetic alternatives, and employing gemological techniques for differentiation empowers buyers to make informed and confident choices. As consumers, let’s embrace the beauty of yellow sapphires while navigating the gemstone market with knowledge and discernment.

Frequently Asked Questions :

  1. Are all Yellow sapphire treated ?

No, not all yellow sapphires undergo treatments. However, it is common for gemstones to be treated to enhance their color and clarity. Buyers should inquire about any treatments applied before making a purchase.

  1. What is the most common treatment for Yellow Sapphires ?

Heat treatment is the most common method used to enhance the color of yellow sapphires. This process involves heating the gemstone to high temperatures to improve its color saturation.

  1. Can synthetic Sapphires be identified easily ?

While synthetic sapphires closely mimic natural ones, gemologists can use various methods for identification. These include spectroscopy, microscopic examination, and fluorescence testing. Synthetic sapphires may lack natural inclusions found in their natural counterparts.

  1. How can I check if my Yellow Sapphire is natural or synthetic at home ?

While some basic observations can be made at home, a definitive identification typically requires professional gemological testing. Factors such as color consistency, inclusions, and fluorescence can offer clues, but microscopic examination  are best left to experts.

  1. Can Yellow Sapphire change color over time ?

While yellow sapphires are generally stable, exposure to extreme heat or radiation can alter their color. It is advisable to protect your yellow sapphire from prolonged exposure to high temperatures and harsh chemicals to maintain its original color.