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Gia | 3.5ct Elongated Cushion Lab Diamond Engagement Ring

$7,740.00 AUD $6,579.00 AUD
Tax included.

Same day resize and shipping before 1pm

SKU: 1-9453

Product Details

Gia uses three elongated cushion cut diamonds in platinum: a 1.51ct centre stone flanked by two side stones totalling 2.02ct, making the total diamond weight 3.53ct across the ring. Setting three cushion cuts in the same cut family gives the ring a consistent visual language: all three stones share the same pillow-shaped outline.

E / VVS2 centre, all three IGI certified. Designed and made by Matthews Jewellers, Newcastle. Fine jewellers since 1957.

Centre Carat Weight: 1.51ct Lab Grown Diamond

Colour: E

Clarity: VVS2

Report Number: LG679512663 & LG669437213 & LG671410641

Setting Style: Cathedral

Accent Diamonds: Side Diamonds: 2 = 2.02ct Certifications: IGI669437213, IGI671410641 Metal: Platinum

Band Width: 2.0 mm x 1.5mm

Metal Colour: Platinum

Finger Size: M

Free re-sizing and shipping available within 24 hours of purchase (Monday to Friday).

20% off your Wedding Rings

Enjoy 20% off your wedding rings and 10% back in Matthews Money when you purchase your engagement ring with us.

30 Day Free Returns

Changed your mind? No problem.

We offer free 30-day returns on all Ready to Wear pieces purchased online.

Simply contact us for a free prepaid satchel — just ensure your item is in its original boxing before sending it back.

Your original postage bag is reusable, so place your item inside, seal it up, and send it our way.


Complimentary Resizing

We offer complimentary resizing for the lifetime of your engagement ring. If you need your ring resized before it’s shipped, please let us know and include your preferred size in the notes section at checkout.

Not sure on the size? Your piece can be resized after your proposal. Get in touch and we can organise this.

Shipping and Timing


We offer complimentary Express Shipping Australia-wide on all orders. Each piece is carefully packaged and fully insured for peace of mind during transit.

For ready-to-wear items, please allow 2-3 business days for dispatch. Made-to-order and custom pieces typically take 6–8 weeks. Need it sooner? Contact us—we’ll do our best to accommodate your timeline.

Our Guarantee


With decades of experience and a proud family legacy, we stand behind every piece that leaves our workshop. Each item is a reflection of our craftsmanship, integrity, and care—backed by our Lifetime Guarantee. When you choose us, you're choosing quality that lasts a lifetime.

Ring Sizing Guide
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Visit Us

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