Ask most people where sapphires come from and they will say Sri Lanka, or perhaps Kashmir. Very few will say northern New South Wales. Yet some of the most characterful sapphires in the world are mined a few hours' drive from our Pitt Street studio, and for a long stretch of the twentieth century Australia supplied a large share of the world's sapphire.
This guide covers what makes a good sapphire, what makes an Australian sapphire different, and how to choose one you will still love in thirty years.
What a sapphire actually is
Sapphire is corundum — the same mineral as ruby. Chromium turns corundum red and we call it ruby; every other colour is sapphire. Blue comes from traces of iron and titanium, and the exact balance between them decides whether a stone reads cornflower, royal, inky or teal.
Sapphire sits at 9 on the Mohs hardness scale, second only to diamond. For a ring worn every day that matters enormously: sapphire shrugs off the knocks that would scratch or chip softer stones like emerald or morganite. It is one of the few coloured gemstones we recommend without hesitation for an engagement ring.
Australian sapphires: where they come from
Australia has two main sapphire regions.
New England, New South Wales. The country around Inverell and Glen Innes has produced sapphire for well over a century. These stones formed deep underground and were carried to the surface by ancient volcanic activity, then weathered out into the gravels where they are found today.
Central Queensland. The gemfields around Anakie, Rubyvale and the aptly named town of Sapphire are among the largest sapphire fields in the world, and still worked by small miners and fossickers.
For couples who care where a stone came from, this is a genuine advantage. An Australian sapphire has a short, traceable journey from a known field to a Sydney workbench — something a certificate from a distant market cannot always offer.
What makes Australian sapphire look different
Australian blue sapphires tend to be deeper and richer than the bright cornflower blues of Sri Lanka, often with a subtle green or teal undertone. For decades the trade undervalued this, and a good deal of Australian material was sent overseas and sold under other names.
Tastes have changed. The deep, slightly moody blue-green that was once considered a flaw is now exactly what many buyers look for. It looks less like a stock gemstone and more like something with a place of origin.
Parti sapphires are a distinctly Australian curiosity. These stones show two or three distinct colours in a single crystal — blue meeting green, green shading into yellow — often in bands or zones you can see with the naked eye. No two are alike, and they are rarely found in quantity anywhere else.
Australia also produces fine yellow and golden sapphires, particularly from Queensland, which are clean, bright and considerably more affordable than blue stones of the same quality.
How to judge a blue sapphire
Colour comes first. Look for a saturated blue that stays alive under different lights. A stone that is too dark goes black indoors; one that is too pale reads grey. Remember where you will wear it: if you spend most of your day under office lighting, a slightly lighter stone will serve you better than one that only glows in the sun.
Watch for colour zoning. Sapphire often grows with bands of stronger and weaker colour. A skilled cutter orients the stone so the zoning is invisible from the top. Look at the stone face-up, the way it will actually be seen, rather than from the side.
Clarity standards are not diamond standards. Small inclusions are normal and usually invisible at arm's length. A sapphire that is flawless, large and inexpensive deserves a close look — it may be synthetic.
Cut matters more than size. A well-cut 1.2 carat sapphire will look brighter and often larger than a poorly cut 1.6 carat stone, because a badly proportioned stone leaks light and shows dark patches. Many coloured stones are cut to keep weight rather than to look beautiful; good cutting is worth paying for.
Beyond blue
Some of the best value in the sapphire world is outside blue. Because demand concentrates on blue, fine teal, green, yellow, peach and lilac sapphires often cost a fraction of a blue stone of similar quality — with the same hardness and durability.
Teal sapphires in particular have become an increasingly popular choice for engagement rings. They suit people who want colour without the formality of classic royal blue.
Treatment: the two questions to ask
Most sapphires on the market have been heated. Heat treatment is permanent, stable and universally accepted, and it is not a reason for concern. What matters is that it is disclosed. Ask any jeweller:
- Has this stone been heated, and has it had any treatment beyond heat?
- Is there an independent laboratory report?
Treatments beyond heat, such as beryllium diffusion, change colour in ways that are less stable and worth much less. They are legitimate to sell only when they are clearly disclosed. Unheated sapphires, including some Australian material, carry a premium for their rarity — and should always come with documentation.
Setting a sapphire
Metal changes the colour you see. Platinum and white gold keep a blue sapphire crisp and cool. Yellow gold warms teal and green stones beautifully. Rose gold with a peach or teal sapphire is one of the loveliest combinations in contemporary jewellery.
Protect the edges. Sapphire is hard, but its edges are where damage happens. A bezel or half-bezel protects a stone worn every day far better than a tall four-claw setting, and suits the organic character of Australian stones particularly well.
Caring for your sapphire
Warm water, mild soap and a soft brush take care of everyday build-up. Ultrasonic cleaning is fine for untreated and heat-treated stones, but avoid it for any stone with fracture filling. Have the setting checked once a year — claws wear, and it costs nothing to check.
If you are weighing a ruby instead, read our guide to how to choose a ruby.
See them in person
Sapphire colour does not survive a photograph. Screens, lighting and editing change what you see, and the difference between a good teal and a great one is invisible online.
At our Pitt Street studio you can compare sapphires side by side in daylight and under lamp light, with a gemologist explaining what you are looking at. If you have a design in mind, or a family stone you would like reset, bring it in — most of the rings we make begin exactly that way.
TayaM Jewellery — 321 Pitt Street, Sydney CBD. Bespoke design and in-house gemological expertise.
