5.15ct Greenish Blue Australian Sapphire Unheated
Gem Type: Natural Sapphire Corundum
Colour: Greenish-Blue
Carat Weight: 5.15
Shape: Trillion
Crown Cut: Brilliant
Pavilion Cut: Step
Clarity: Eye Clean
Treatment: Unheated
Measurements: 10.23 x 10.40 x 6.61mm
Origin: Australia
Lab Certification: GFCO Gem Lab
This 5.15ct Greenish Blue Australian Sapphire was sourced as rough and cut in house by The Sapphire Merchant.
The stone has a very dark, distinctly Australian tone, with beautiful blue and green colours sitting beneath the surface. Under stronger lighting, these colours reveal themselves through the darker body, giving the sapphire a mysterious character with flashes of hidden brilliance.
Its trillion cut adds a bold, geometric shape that complements the depth of the colour. At over 5ct, this is a substantial Australian sapphire, offering impressive size and presence for someone wanting a larger gemstone without the bright appearance of a traditional blue sapphire.
Completely natural and unheated, this sapphire retains the colours it formed with in the earth. It would make a striking centre stone for a custom ring or pendant, particularly for someone drawn to darker gemstones with a strong, individual character.
Buy this natural unheated Australian sapphire as a loose gemstone or custom design a jewellery piece with The Sapphire Merchant.
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Estimated Delivery:Oct 21 - Oct 25
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Free Shipping within New Zealand, and on all
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5.15ct Greenish Blue Australian Sapphire Unheated
Create Your Perfect Ring
- Select your Gemstone. Purchase through our website and begin your custom jewellery experience.
- Share your design idea. We will work through the details with you to better visualise your concept, including the ring style, gold colour, and diamond detailing. We can also make earrings and pendants. Our talented designer creates a life-like computer-rendered drawing of your jewellery concept from this information. Edits can be made to perfect the design and a quote is given upon the finalised design.
- We will craft your custom ring. You will receive a beautiful custom jewellery box, along with certifications and reports verifying the quality and authenticity of your piece.
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“The sapphire is the most beautiful of all blue stones, and the most sovereign for the eyes.” - Anselmus de Boodt, 1609 (Royal gem physician to Rudolph II)
Australian Sapphires
Australian sapphires are prized across Australia and New Zealand because they are unearthed from the red soil beneath us. Mined from the historic sapphire fields of New South Wales and Queensland, including Inverell, Glen Innes, and Anakie, these natural sapphires display a rich spectrum of deep blue, teal, green, yellow, and the highly sought-after Australian parti sapphire. Formed in basalt lava flows millions of years ago, Australian sapphires are renowned for their inky colour saturation, making them an ideal choice for engagement rings and custom sapphire designs.
Commercial sapphire mining in Australia began in the late 1800s, with the country becoming one of the world’s leading sapphire producers throughout the 20th century. Today, Australian sapphire mining is heavily regulated, with strict environmental management and land rehabilitation standards in place, a key consideration for ethically minded jewellery buyers in Australia and New Zealand. Valued for their ethical sourcing, durability, and bold natural colour, Australian sapphires remain a favourite among custom jewellery clients across Australasia seeking gemstones of integrity and enduring beauty.