Technical Information on Gemstones

Approved Gemstone Testing Laboratories

Approved Gemstone Testing Laboratories

Gem Rock Auctions has one of the largest range of Certified Gemstones online. Browse this list of approved gemstone testing laboratories.
  • 25th Jun 2019
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Aventurescence Or Gemstone Schiller

Aventurescence Or Gemstone Schiller

In the world of gemstones there are special types of stones that show the Schiller effect or Aventurescence. Lets explore what these gems are and how they behave
  • 25th Jun 2019
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Azotic Treatment Of Quartz And Topaz

Azotic Treatment Of Quartz And Topaz

Azotic treatment of Topaz and Quartz is a treatment that creates a layer of color over a gemstone. Learn more about this treatment and check out our stones fro sale.
  • 25th Jun 2019
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Blue Sapphires: What Makes Sapphires Blue?

Blue Sapphires: What Makes Sapphires Blue?

The color of a Sapphire is cuased by different impurities inside the gemstone. Titanium for example creates the beautiful deep blue that we love so much in Sapphires
  • 25th Jun 2019
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Colored Gemstone Grading

Colored Gemstone Grading

While there is a strict scale to grade Diamonds on that was devised by the Gemological Institute of America (GIA), there is not an international standard for grading clarity in colored gems.
  • 25th Jun 2019
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Colorful Garnet Gemstones To Suit Everyone's Taste

Colorful Garnet Gemstones To Suit Everyone's Taste

In the world of Garnet there is a multitude of colors to suit everyone's taste. Check out what colors Garnets are available in and how they are all related.
  • 25th Jun 2019
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Colour Changing Gemstones

Colour Changing Gemstones

Color changing gemstones are gemstones which change color in different lighting conditions. Learn more about these stones and browse our gemstones for sale.
  • 25th Jun 2019
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Emerald Inclusions - What The Inner World of Emeralds Can Tell You

Emerald Inclusions - What The Inner World of Emeralds Can Tell You

Emerald Inclusions are fascinating. inside each Emerald the tiny inclusions tell a story about where the gem came from and how it formed.
  • 25th Jun 2019
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Four Tools For Gemstone Testing

Four Tools For Gemstone Testing

There are so many tools on the market for testing a gemstone, but what are the main tools required for simple analysis. Lets look at four tools for gemstone testing.
  • 25th Jun 2019
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Gemstone Compliance

Gemstone Compliance

Compliance issues in the Gemstone Industry are affecting countries worldwide. Sellers will face audit requests to prove the legitimacy of their business.
  • 25th Jun 2019
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Gota De Aceite Emeralds

Gota De Aceite Emeralds

Gota De Aceite Emeralds have a special feature which increases their value. Read more about this rare type of Emerald and learn how it adds to the value.
  • 25th Jun 2019
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How Do Gemstones Form?

How Do Gemstones Form?

How do gemstones form in the earths crust? It is far more complicated than first thought but we have broken it down to make it easier to understand
  • 25th Jun 2019
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How Do They Treat Ruby Gemstones?

How Do They Treat Ruby Gemstones?

Have you ever wondered how they treat Ruby gemstones? There are so many different types of treatments on the market and we will help to explain them
  • 10th Aug 2019
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How Does Alexandrite Change Color?

How Does Alexandrite Change Color?

Alexandrite is one of the rarest gemstones on the planet. It has the ability to change colors under different light. Lets explore how it does that
  • 25th Jun 2019
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Is Amber a Mineral?

Is Amber a Mineral?

Amber is a gemstone, but it is not a mineral. Let's explore what makes Amber tick and why its not considered to be a mineral.
  • 25th Jun 2019
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MOHS Hardness Scale For Gemstones

MOHS Hardness Scale For Gemstones

The MOHS scale of hardness is universally used when describing gemstones. But what does it mean and how can you use it help protect your gems and jewelry
  • 25th Jun 2019
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Oregon Sunstone Durability And Hardness

Oregon Sunstone Durability And Hardness

The hardness of Oregon Sunstones ranges from 6.0 to 6.5 on the Mohs Scale. It’s a suitable for a wider variety of jewelry types because of its hardness rating.
  • 25th Jun 2019
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Pearl Treatments

Pearl Treatments

There are many treatments for Pearls that change their apperance. Most of these treatments are acceptable. Learn more about this gemstone and browse the beautifully cut stones we have for sale.
  • 25th Jun 2019
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Phenomenal Gemstones — Gemstones with Optical Properties

Phenomenal Gemstones — Gemstones with Optical Properties

Ever heard of phenomenal gemstones? These gemstones display amazing optical effects under different lighting, such as cats eyes and stars. Read more about these amazing gems..
  • 25th Jun 2019
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Physical Properties of Gemstones

Physical Properties of Gemstones

Each gemstone has it's own unique set of physical properties that can be used to identify it. These include hardness, growth patterns and cleavage. Learn more about the physical properties of gemstones.
  • 25th Jun 2019
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Sapphire Gemstone Treatments On Gem Rock Auctions

Sapphire Gemstone Treatments On Gem Rock Auctions

Sapphires listed on GemRock Auctions are categorized in regards to the treatment methods used. Learn how we deal with treatments.
  • 25th Jun 2019
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Sapphire Treatments

Sapphire Treatments

Sapphire Treatments refers to the process of improving the clarity, colour and value of Sapphires that have been mined out of the ground.
  • 11th Sep 2019
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The Four Cs Of Diamond Quality

The Four Cs Of Diamond Quality

The Four C's are a standard definition on how to describe and judge the quality of a Diamond. let us explain it in more detail.
  • 25th Jun 2019
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Types Of Quartz And The Enhancements Or Treatments Used

Types Of Quartz And The Enhancements Or Treatments Used

Quartz Crystal is one of the most common Minerals on Earth. It is one of the most loved gems and for centuries has been used for jewelery and carvings. Quartz Crystal is one of the most common Minerals on Earth. It is one of the most loved gems and for ce
  • 25th Jun 2019
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What are Synthetic Gemstones, Imitation and Simulants?

What are Synthetic Gemstones, Imitation and Simulants?

What are Synthetic Gemstones, Imitation and Simulants? We will explain the difference and how some of them are created.
  • 4th Aug 2019
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What Causes The Color In Oregon Sunstone?

What Causes The Color In Oregon Sunstone?

Sunstone occurs in a range of colors that begins with colorless and ranges through to yellow, orange and red. The color is determined by the abundance and size of the copper platelets within the stone.
  • 25th Jun 2019
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What is a Carat And Is It Related To Karat?

What is a Carat And Is It Related To Karat?

Carat and Karat are two terms you will here in the Jewelry business that sound exactly the same. They have very different meanings though.
  • 25th Jun 2019
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What Is A Mineraloid

What Is A Mineraloid

A mineraloid is a substance that is very similar to a mineral, but it does not demonstrate crystallinity.
  • 25th Jun 2019
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What Is Aquamarine Made Of?

What Is Aquamarine Made Of?

Aquamarine is made of a Beryllium, Aluminium Silicate and is part of the Beryl family of minerals. Beryl can be many colors but when it’s blue or blue-green it is called aquamarine.
  • 25th Jun 2019
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What is the Crystal shape of Garnet?

What is the Crystal shape of Garnet?

The main crystal shapes of Garnets are dodecahedral and trapezohedral. Both shapes are polyhedrons, which are three-dimensional geometric figures with flat faces.
  • 25th Jun 2019
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