Topaz Gemstone Guide: London Blue, Swiss Blue, Sky Blue & Imperial Topaz

From London blue to imperial peach

If you ask me which blue topaz I love most, the answer is easy: London blue. There's something about that deep, slightly moody, almost inky blue that I absolutely adore. It's rich without being overly bright, and it looks beautiful in both silver and gold. But I also have a soft spot for sky blue topaz. In fact, it might be my second favorite. And Swiss blue? That's just fun, especially when I get to mix it with other colorful gemstones. Then there's imperial topaz, which takes us in an entirely different direction with those gorgeous peachy, golden, and sometimes pinkish tones. Topaz is much more interesting than people sometimes realize.

14k London Blue Topaz handmade natural gemstone jewelry by Mettle by Abby
14k London Blue Topaz — explore this one-of-a-kind piece

What is topaz?

Topaz is an aluminum fluorosilicate mineral that forms in certain igneous and related geological environments. It has a hardness of 8 on the Mohs scale, making it relatively resistant to scratches. However, topaz also has perfect cleavage in one direction. This means a sharp impact in the wrong place can cause a stone to split. It's a beautiful gemstone for fine jewelry, but its durability depends on more than its hardness number. Topaz naturally occurs in several colors, including colorless, yellow, brown, orange, pink, and reddish shades. Blue topaz is extremely popular, but there's an important detail about how most commercial blue topaz gets its color.

London blue topaz: my favorite

London blue is the deepest of the three familiar commercial blue topaz color categories. It typically has a rich, dark blue appearance, sometimes with a grayish or slightly greenish undertone. I love its depth. There's something sophisticated about London blue that feels different from the brighter, more tropical blues. It can be dramatic without being loud. For me, London blue is one of those gemstones that doesn't need much help to look incredible. A beautiful cut and a thoughtful setting can be enough.

London Blue Topaz Entwined Ring handmade natural gemstone jewelry by Mettle by Abby
London Blue Topaz Entwined Ring — explore this one-of-a-kind piece

Sky blue topaz: light and lovely

Sky blue topaz is much paler. Think clear blue skies, soft watercolor washes, and delicate, airy color. I think sky blue might actually be my second favorite topaz. It has an understated quality that makes it especially versatile. I love the way it looks with silver, but it can also be beautiful alongside warm gold or other pastel-colored gemstones. It doesn't compete for attention. It just glows.

Swiss blue topaz: bright, bold, and fun

Swiss blue is generally the most vivid, saturated blue of the three familiar categories. It's bright, cheerful, and almost electric. While London blue is my favorite on its own, Swiss blue can be especially fun to use in a mixed-gemstone design. That strong color gives me something exciting to work with. I can imagine pairing it with contrasting warm colors or using it as a bright accent among more subdued stones. Sometimes a design needs a little jolt of color, and Swiss blue can deliver exactly that.

Sky Bar Hook Bracelet handmade natural gemstone jewelry by Mettle by Abby
Sky Bar Hook Bracelet — explore this one-of-a-kind piece

Is blue topaz natural?

This is an important distinction. Topaz is a natural mineral, but most blue topaz sold commercially has been treated to produce its blue color. The process generally involves irradiation followed by heating. The treatments alter color centers within the crystal structure, producing different shades of blue. The resulting gemstone is still natural topaz. Its blue color has been enhanced through treatment. Naturally occurring blue topaz does exist, but it is generally much paler and less common in the marketplace. London blue, Swiss blue, and sky blue are commercial color descriptions rather than separate mineral varieties or rigid scientific grades. I think transparency about treatments is important. A treated gemstone can be beautiful, but customers deserve to understand what they're purchasing.

Imperial topaz: peach, gold, and pink

Now we get to an entirely different side of topaz. Imperial topaz is associated with beautiful warm colors, particularly golden orange, peach, pinkish orange, and sometimes reddish pink. And those peachy colors are gorgeous. Some specimens have a warmth that almost seems to radiate from within the stone. The term imperial topaz doesn't have one universally enforced color definition, so it's important to look at the actual gemstone rather than rely on the name alone. Fine natural pinkish-orange and reddish topaz can be particularly valuable. The Ouro Preto region of Brazil is especially famous for its imperial topaz.

Where does topaz come from?

Topaz is found in several parts of the world, including Brazil, Pakistan, Nigeria, Sri Lanka, and other locations. It can form in cavities within granitic rocks and in environments associated with certain pegmatites and hydrothermal activity. Some topaz crystals grow remarkably large, and beautifully formed natural crystals can be impressive specimens even before cutting. Topaz is also the traditional November birthstone, alongside citrine. Blue topaz is a popular alternative December birthstone, together with turquoise, zircon, and tanzanite.

Topaz throughout history

Topaz has been admired for centuries, although the name was historically applied to several different yellow gemstones. Ancient descriptions of topaz don't always correspond to what modern mineralogists identify as topaz. The gemstone has been associated with strength, protection, and wisdom in different traditions. I find it fascinating how much the language of gemstones has changed as people learned to distinguish minerals scientifically.

How to care for topaz jewelry

Topaz is fairly hard, but its perfect cleavage makes it vulnerable to sharp blows. I recommend avoiding impacts, extreme temperature changes, and ultrasonic cleaning. Clean gently with mild soapy water and a soft cloth, and store your topaz separately from other jewelry. For rings, thoughtful setting design can help protect the stone, especially at exposed edges.

Why I love designing with topaz

Topaz gives me so many different personalities to work with. London blue is rich and moody. Sky blue is soft and delicate. Swiss blue is bright and playful. Imperial topaz is warm, peachy, and luxurious. And because I make one-of-a-kind jewelry, I don't have to choose one approach for every piece. I can let the particular stone guide the design. Some days that means a deep London blue focal point. Other days it means mixing vivid Swiss blue with an unexpected palette of natural gemstones. That's one of my favorite things about being a jeweler: finding a gemstone I love and figuring out what it wants to become.

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Every piece I make is one of a kind. Here are some pieces from my collection featuring topaz.

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