Topaz: A Complete Guide
TL;DR: Topaz occurs naturally in a wide colour range, though most blue topaz on the market has been treated to achieve its colour. At 8 on the Mohs scale it's genuinely durable for daily wear, and offers strong size and colour for the price compared to harder, rarer alternatives.
Natural Colour Range
Topaz occurs naturally in colourless, pale blue, yellow, orange, pink, and the rare and valuable Imperial topaz — a rich orange-pink to red-orange colour found almost exclusively in Brazil. Most naturally occurring topaz is pale or colourless; the vivid blue most people associate with topaz is achieved through treatment rather than found in nature at that saturation.
How Blue Topaz Gets Its Colour
Colourless or pale topaz is irradiated and then heat-treated to produce the saturated blue shades sold as sky blue, Swiss blue, and London blue topaz — an established, stable, and fully disclosed treatment throughout the trade. The resulting colour is permanent under normal wear and does not fade or require special care.
Durability
At 8 on the Mohs hardness scale, topaz is genuinely durable and well suited to daily wear — harder than emerald or morganite, though it has a distinct cleavage plane that means a sharp, direct blow at the wrong angle can cause it to split. Normal daily wear poses no real risk; the concern is specifically hard, direct impact.
Imperial Topaz
Imperial topaz — a rich, saturated orange-pink to red-orange — is the rarest and most valuable topaz variety, occurring naturally without treatment and commanding prices well above the more common treated blue varieties.
Topaz at À Vie Diamonds
We can source topaz across its colour range, from accessible treated blues to rare natural Imperial topaz. Get in touch to discuss a commission.
Related Reading
- Citrine: A Complete Guide — another durable, good-value treated gemstone
- Garnet: More Than a January Birthstone
Frequently Asked Questions
Is blue topaz a natural colour? Most blue topaz on the market is irradiated and heat-treated from colourless or pale rough — a standard, permanent, and fully disclosed treatment.
Is topaz durable enough for daily wear? Yes, at 8 on the Mohs scale, though its distinct cleavage plane means it should avoid sharp, direct impacts.
What is Imperial topaz? A rare, naturally occurring orange-pink to red-orange topaz variety, found almost exclusively in Brazil, considerably more valuable than treated blue topaz.
Last reviewed: July 2026 · À Vie Diamonds