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4 mm Princess-cut sapphire. A beautiful sea blue, untreated from Queensland, Australia.

Untreated sapphire from Queensland, Australia. Princess cut, 4.7 mm, in rich green with teal flashes.

Untreated sapphire from Queensland, Australia. Princess cut, 4.7 mm, with a gorgeous deep olive-green tone.

An unheated, Australian sapphire, in a marquise cut. This responsibly sourced gemstone is a dark teal colour.

This trilliant sapphire from Queensland, Australia has an unusual colour and a cheeky sparkle.

A big and beautiful sapphire from Australia, with a uniform, deep green colour throughout.

A responsibly sourced parti sapphire from an artisanal mine in Queensland, Australia. The stone has a subtle colour combination of blue and yellow.

A very cool, Australian sapphire, showing flashes of blue, green and yellow. This fabulous gemstone would make an exceptional engagement ring.

A mighty, 1.8ct sapphire from Queensland, Australia. This is a gemstone to make an impression. Responsibly sourced and not treated in any way.

This Australian sapphire is mostly a medium green colour, but also has flashes of yellow when viewed from certain angles.

An unheated, Australian sapphire, cut into a pretty pear shape. This responsibly sourced gemstone has plenty of sparkle and a lovely colour.

A responsibly sourced parti sapphire from an artisanal mine in Queensland, Australia.

A responsibly sourced bi-colour sapphire from an artisanal mine in Queensland, Australia. 

A responsibly sourced parti sapphire from an artisanal mine in Queensland, Australia.

Untreated sapphire from Queensland, Australia, weighing 0.81 carats. It has a soft pastel yellow with delicate blue tinting at the corners, giving ...

A bright pink sapphire with a nice square-cushion shape.

Brilliant-cut, untreated sapphire in a pale apricot tone with warm sparkle. Weighs 1.34 carats and has a lovely "glow".