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What is London Blue Topaz? » Gemstone 101

What is London Blue Topaz
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What is London blue topaz?

If you’re into blue stones, chances are, you’ve encountered this intriguing gemstone that’s often confused with blue sapphire. In this Gemstone Series, we’ll take a closer look at this powerful stone and learn a little bit more about the factors that make it popular.

What is London Blue Topaz?

What is Topaz

Coming from an exceptionally wide variety of Topaz colors, London blue topaz is a dark blue topaz with medium to dark tone and saturation. Compared to the Swiss blue topaz, London blue is more valuable and a market favorite.

Natural blue topaz is rare as natural topaz is mainly colorless. As such, most blue topaz in the market today are treated with radiation.

What Makes London Blue Topaz Blue?

To achieve the color, they expose topaz to radiation in a nuclear reactor. Upon exposure to fast neutrons, the radiation changes the color centers of the stone, which produces a deep blue color. Other stones require further heat treatment to lighten the inky color.

Many people have raised concerns about the safety of blue topaz due to radiation; however, there are strict rules in place for consumer protection. For instance, in the USA, companies that treat gemstones with radiation must be licensed by the Nuclear Regulatory Commission. Additionally, gemstones that are treated this way are radioactive; thus, they are stored for months until the radioactivity reduces to a safe level.

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History and Meanings

The name ‘topaz’ relates to the Sanskrit word ‘tapas,’ meaning fire. They also associate it with the Egyptian island of Topazios, although the island never produced topaz but rather olivine—often confused with topaz—and peridot.

Germany’s Erzgiberge Mountains were the first known source of yellow to brown topaz until a large topaz deposit came about in the 1730s in Brazil. Brazil remains to be the largest producer of topaz in the world.

The Ostro: The Famous Blue Topaz

The Ostro is the largest blue topaz displayed in the UK’s Natural History Museum’s Minerals Gallery. British Explorer Max Ostro discovered the rough material in 1960, from which the Ostro was cut from.

Ostro is 15 centimeters long and 10.5 centimeters wide with a total weight of 9,381 carats.


Blue topaz echoes the energy of knowledge and wisdom; hence, stone believers commonly associate it with clarity of feelings, honesty, self-confidence, and the ability to learn complex ideas.

Perhaps because of its color, blue topaz is also known to symbolize calmness and peacefulness, and it’s also ideal for spiritual attunement.

Blue Topaz, such as the London blue topaz, is a birthstone for December.

How to Care for and Clean Topaz?

With only a score of 8 on the Mohs Hardness Scale, topaz requires extra care and attention to keep it looking beautiful. It’s not tough because of its basal cleavage, which makes it prone to breakage.

  • Avoid prolonged exposure to sunlight or heat to prevent color from fading.
  • Do not use ultrasonic cleaning.
  • If possible, only use topaz in protective mountings like pendants.
  • Keep away from abrasive cleaners or buffing wheels as these cleaners might remove the color coating.

To care for and clean topaz jewelry the right way, consider the following.

  • Put on your topaz jewelry only after applying your makeup or styling your hair.
  • Avoid putting lotion or hand sanitizer while wearing it.
  • Do away from special jewelry cleaners. Simply soak it in slightly warm, soapy water for 10 to 15 mins.
  • Carefully rub any dirt build up and soak it again in warm water before patting it dry.
  • If possible, store it away from other gemstones and away from light.

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How to Photograph London Blue Topaz with the GemLightbox Macro

In this section, we’ll show you how to photograph London blue topaz using the GemLightbox Macro and a smartphone.

You’ll need:

Step 1. Power up the GemLightbox Macro and remove the front reflector cover.

Remove the front reflector cover

First, power up the GemLightbox Macro by pushing the power button on the side of the box. Afterward, remove the front reflector cover.

If this is your first time using Macro, ensure that you set up the smartphone holder first for ease of use in the future. You can watch the complete setup process here.

Step 2. Put the London blue topaz inside the box, on the stone holder.

Place the diamond into the GemLightbox Macro

Next, place the London blue topaz inside the Macro on the stone holder or disc.

Macro comes with three different discs in three different colors and sizes to accommodate different stone sizes and backgrounds. For this demonstration, we used a solid white background.

The three different colors are white, grey, and black. Each disc in varying sizes can hold stones from 1ct to 10ct and above.

After placing the gem inside, don’t forget to put back the front cover.

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Step 3. Open the GemLightbox app.

Open the GemLightbox app

Then, put your smartphone on the smartphone holder and open the GemLightbox app.

The GemLightbox app is available to download for both iOS and Android users.

You may click here to learn more about the features of the GemLightbox app.

From here, you may tap to focus, zoom in or out, or adjust the brightness level as you desire. If you want to capture a 360 video, go to the video mode and choose the angle you want to capture.

With the GemLightbox app, you can capture a video of London blue topaz and other gemstones from a 360 angle, 90, and 45 in either slow or fast rotation.

Step 4. Click to capture!

Click to capture

Finally, click to capture and save.

In just a few steps, we were able to capture photos and videos of London blue topaz at different angles with 10x magnification. See the results below.

Blue topaz

Watch the complete Macro demonstration below.

Frequently Asked Questions:

What is the difference between London Blue Topaz and Blue Topaz?

A natural blue topaz is rare. London blue topaz is heat-treated.

How can you tell if London blue topaz is real?

London blue topaz is heat-treated with a medium blue color that’s deeper than aquamarine or Swiss blue topaz but lighter than sapphire. It’s best to consult a jewelry professional who can tell you the type of topaz you have.

Which is better, Swiss blue or London blue topaz?

London blue topaz is a market favorite and more expensive and valuable than the Swiss blue topaz.

Is blue topaz worth anything?

It depends on your definition of value. Topaz is a mass-market gem and is not very expensive.

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