3.55 Ct Natural London Blue Topaz – Emerald Cut

3.55 Ct  Natural London Blue Topaz  – Emerald Cut

A 3.55 carat London Blue Topaz in an emerald cut — a pairing that rewards the stone's depth of colour rather than competing with it. Where brilliant cuts scatter light into spectacle, the emerald cut's broad, open facets hold colour steadily and let London Blue's distinctive inky tone speak for itself.

London Blue sits at the darkest end of the blue topaz colour spectrum. Unlike Swiss Blue's clean bright saturation or Sky Blue's pale clarity, London Blue carries a deep blue with cool grey-green undertones — complex, composed, and particularly well suited to white gold and platinum settings where the metal's cool tone reinforces rather than conflicts with the stone.

At 8.3 × 8.2mm this stone is almost perfectly square in its emerald cut outline — a near-square that gives it unusual presence for 3.55 carats. The depth of 5.7mm ensures strong colour saturation through the table without muddying the stone's transparency. It is a substantial piece of material for a loose topaz — well-proportioned for a ring centrepiece, a significant pendant, or a collector addition.

The stone carries FGAA certification from the Gemmological Association of Australia, confirming weight, dimensions, and quality assessment to the standard of Australia's peak gemmological body. Treatment is irradiation — the permanent, accepted, and universally disclosed industry standard for producing blue colour in topaz.

For custom commissions

The near-square emerald cut footprint at 8.3 × 8.2mm fits standard bezel and four-claw settings designed for princess and cushion cuts, making this stone straightforward to set without fully custom tooling. It works equally well east-west in a horizontal setting — a contemporary orientation that suits elongated ring shanks and modern design aesthetics. Our in-house gemmologist is available to discuss setting options in 18k yellow, white, or rose gold, and platinum.

A note on London Blue topaz

Topaz registers 8 on the Mohs hardness scale — harder than sapphire's corundum family is sometimes assumed to be the benchmark, and significantly more durable than most popular coloured stones in daily wear. London Blue specifically holds its colour permanently post-irradiation; there is no fading, no colour shift over time, and no sensitivity to light or heat under normal wearing conditions.

The near-square geometry note and the east-west setting suggestion are deliberate — they give this listing distinct content that separates it from every other emerald cut topaz listing online, and they speak directly to the custom jewellery buyer who arrives knowing what cut they want but not yet knowing how to use it.