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As a gemstone enthusiast, you might have heard about the beautiful and unique ruby zoisite. This captivating
gemstone is a natural combination of ruby and zoisite, creating a harmonious blend of colors and energies.
However, with the popularity of this gemstone, there’s always a risk of encountering fake or imitation
stones. In this blog post, we’ll discuss how to tell if a ruby zoisite is real to ensure you’re investing
in a genuine piece.

What is Ruby Zoisite?

Ruby zoisite, also known as anyolite, is a metamorphic rock that contains both ruby and green zoisite
crystals. It was first discovered in Tanzania in 1954 and is known for its vibrant green color with
distinct ruby inclusions. Ruby zoisite is believed to possess various metaphysical properties, including
emotional healing, vitality, and creativity.

Signs of a Genuine Ruby Zoisite

Here are some key factors to consider when determining if a ruby zoisite is real:

1. Color and Pattern

One of the most distinctive features of a genuine ruby zoisite is its unique color pattern. The gemstone
should exhibit a rich green color with black hornblende inclusions and distinct, well-formed ruby
crystals. The ruby inclusions can range from pink to deep red, while the zoisite is usually a medium to
dark green color. A fake ruby zoisite may have an unnatural color or poorly defined ruby inclusions.

2. Luster and Transparency

A genuine ruby zoisite has a vitreous (glass-like) to pearly luster, while fake stones may appear dull or
waxy. The gemstone should also be translucent to opaque. If the stone appears too transparent or has an
unnatural sheen, it could be an imitation.

3. Hardness

Ruby zoisite has a Mohs hardness of 6 to 7, making it a relatively durable gemstone. To test its hardness,
try scratching the surface of the stone with a steel nail. If the nail leaves a scratch, the ruby zoisite
might be fake, as a genuine stone should not be easily scratched.

Professional Testing Methods

If you’re still unsure about the authenticity of your ruby zoisite, you can opt for professional testing
methods such as:

1. Refractive Index (RI)

A gemologist can use a refractometer to measure the refractive index of the stone. The RI of a genuine ruby
zoisite should be between 1.69 and 1.70. If the RI is outside of this range, it could indicate that the
stone is an imitation or a different gemstone entirely.

2. Specific Gravity (SG)

Another method to confirm the authenticity of a ruby zoisite is by measuring its specific gravity. A
genuine ruby zoisite should have an SG of approximately 3.35. A gemologist can perform this test using
specialized equipment, such as a hydrostatic balance.

3. Gemstone Certification

For added peace of mind, consider purchasing a ruby zoisite that comes with a gemstone certification from a
reputable gemological laboratory. This certification should provide detailed information about the
gemstone’s origin, treatment, and authenticity.


By keeping these factors in mind and consulting with a professional gemologist if necessary, you can
confidently determine if your ruby zoisite is genuine. A real ruby zoisite is a beautiful and unique
addition to any gemstone collection, providing both aesthetic appeal and metaphysical benefits.

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