How Can Gemologists Distinguish Lab-Grown Sapphires From Natural Sapphires?

How Can Gemologists Distinguish Lab-Grown Sapphires From Natural Sapphires?

Distinguishing lab-grown sapphires from natural sapphires is challenging, but each artificial creation method leaves telltale signs that an expert gemologist can identify.

The Challenges of Identifying Lab-Grown Sapphires

Chemically and physically speaking, the same materials constitute natural and lab-grown sapphires, and they have the same atomic structure and crystal habit. Gemology labs would identify both lab-grown and natural sapphires as forms of corundum.

As a consumer, however, you may want to make a distinction between lab-grown and natural. Transparency and honesty is required, and a trustworthy official gemstone seller is advised.

Melt Processes Leave Curved Growth Lines

Sapphires created through melt processes like flame fusion may exhibit curved growth lines and curved color bands not found in nature. These curved features are a result of the rotational motion used to grow the crystals.

Czochralski Process Produces Inclusions

The Czochralski process, which pulls a seed crystal from a melt, can also leave distinctive inclusions in the resulting sapphires. These may include gas bubbles and smoky veils that are not typical of natural sapphires.

Hydrothermal Synthesis Leaves "Nail Head" Inclusions

Sapphires grown through hydrothermal synthesis, which uses high-pressure, high-temperature water to grow crystals, may display "nail head" inclusions. These are distinctive inclusions that resemble the heads of nails.

Are Lab-Grown Sapphires Really Sapphires?

Chemically and physically, lab-grown and natural sapphires are identical. They have the same chemical composition and atomic structure. Gemology labs would classify both as forms of the mineral corundum.

However, there are important differences that consumers should be aware of. Lab-grown sapphires are created in a controlled laboratory environment, while natural sapphires form over millions of years deep within the Earth's crust.

The Value of Natural Sapphires

Natural sapphires are generally more valuable than their lab-grown counterparts. Their rarity and the fact that they are the product of natural geological processes contribute to their higher price tag.

Lab-grown sapphires, while chemically identical, lack the unique characteristics and history of natural sapphires. They are often viewed as less desirable by collectors and connoisseurs.

Transparency is Key

When purchasing sapphires, it's important to work with a reputable and transparent seller. They should clearly disclose whether the stones are natural or lab-grown, and provide documentation to support their claims.

Consumers should also educate themselves on the differences between natural and lab-grown sapphires, so they can make informed decisions about their purchases.

Conclusion

Distinguishing lab-grown sapphires from natural sapphires requires the expertise of trained gemologists. Each artificial creation method leaves distinctive signs that can be identified through careful examination.

While lab-grown and natural sapphires are chemically identical, there are important differences in their value and desirability. Consumers should seek out transparent and trustworthy sellers to ensure they are getting the type of sapphire they desire.

By understanding the distinctions between lab-grown and natural sapphires, buyers can make informed choices and appreciate the unique qualities of these beautiful gemstones.