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Wholesale-direct pricingGold Coast showroomInsured delivery Australia-wide07 5538 3988
CTJ Jewellery
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Woman in a spotlight wearing a graduated diamond riviera necklace and a diamond tennis braceletHand with an oval diamond solitaire and eternity band lifting black silk under a spotlightWoman in profile wearing a diamond tennis necklace and round diamond stud earringsDiamond tennis bracelet and halo engagement ring on polished black stoneLoose round brilliant and oval diamonds on dark velvet
Wholesale jeweller, direct to the public · Gold Coast

Natural and lab-grown diamonds, priced like a wholesaler.

View, compare and buy in-stock natural and lab-grown diamonds in our Bundall showroom, with honest guidance and no sales pressure. Or do it all remotely, with insured delivery Australia-wide.

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  • 30+ yearsIn the diamond industry
  • 20,000+Customers served
  • 4.7 on GoogleFrom 108 reviews

The collection

Ready to wear, or made to order by our jewellers.

Natural or lab-grown

Neither is better. It comes down to what matters most to you.

Natural and lab-grown diamonds compared
CharacteristicNaturalLab-grown
OriginFormed in the earth over billions of yearsCreated in a controlled laboratory environment
MaterialPure crystallised carbonPure crystallised carbon
PropertiesDiamond: same physical, chemical and optical propertiesDiamond: same physical, chemical and optical properties
Hardness10 on the Mohs scale10 on the Mohs scale
Grading reportGIA or IGI, origin statedIGI or GIA, origin stated
Valued forGeological raritySize and quality for the budget
PriceHigher, reflecting rarityLower, as they can be grown predictably and quickly

Both are real diamonds.

Natural diamonds are valued for their geological rarity. Lab-grown diamonds have the same physical, chemical and optical properties, and sit at a lower price because they can be grown predictably and quickly.

Don’t buy on the report alone.

Both vary in quality and light performance. We show you natural and lab-grown side by side and explain the trade-offs, so you can choose with confidence.

Natural and lab-grown diamondsSee starting prices

The four Cs

How every diamond is graded, and how to balance them.

Most people don’t want a grade. They want the best-looking diamond for their budget.
The 4Cs of diamonds
Loose diamonds on a grading tray beside a loupe and a grading report
Diamond education

Eight short guides. Everything worth knowing before you buy.

  1. 01Natural and lab-grown
  2. 02The four Cs
  3. 03Diamond shapes
  4. 04Grading reports
  5. 05Settings and metals
  6. 06Price guide
  7. 07Ethics and origin
  8. 08Care and warranty
Open the diamond guide

How it works

Education first. No pressure at any step.

  1. 01

    Consultation

    We talk through your budget, style and diamond options. It’s complimentary, in the showroom, by phone or on video.

  2. 02

    We select

    Natural and lab-grown diamonds chosen for visual performance, not the report alone.

  3. 03

    You compare

    See the diamonds side by side and choose the one that looks best to you.

  4. 04

    We make it

    Designed with CAD where needed, made by our jewellers and quality checked. Most custom engagement rings take two to three weeks.

What our customers say

Rated 4.7 from 108 Google reviews.

Greg’s attention to detail in the design of my ring was exceptional. The end result was beyond my expectation.
Brenda · Google review
I purchased my wife’s engagement ring and both our wedding bands from CTJ. The entire process was second to none.
Paul · Google review
I would recommend CTJ to everyone that is looking for exceptional quality and value in diamonds and jewellery.
Mark · Google review
Read all Google reviews

The people you’ll deal with

A small team. Direct access to experienced consultants.

  • Greg Ward

    Founder

    More than 30 years in the Australian jewellery industry. Custom engagement rings, redesigns and diamond sourcing.

  • Janet Roach

    General Manager

    More than 25 years in jewellery retail. Engagement ring consultations and the client experience.

  • Ally Getmantseva

    Operations and Diamond Consultant

    Diamond education, custom quoting and guiding clients through the bespoke process.

CTJ Jewellery showroom exterior at 37 Upton Street, Bundall, Gold Coast
The showroom

See them in person.

Our Bundall showroom holds an extensive collection of ready-to-view, ready-to-buy diamonds and jewellery. The pieces you see are the actual pieces you buy. Walk in during showroom hours, or book a time and we'll have pieces ready for you.

37 Upton Street
Bundall QLD 4217
07 5538 3988
info@ctj.com.au
Monday 10am to 4pm
Tuesday to Friday 10am to 4.30pm
Saturday 10am to 4pm
Sunday closed
Book a showroom visitGet directions

Questions

Do you sell both natural and lab-grown diamonds?

Yes. We specialise in both and present each on its own merits. Our role is to help you understand the differences so you can choose what best suits your priorities, budget and preferences.

Can I view diamonds before I buy?

Yes. We carefully curate natural and lab-grown diamonds that can be viewed in our Gold Coast showroom, by appointment or as a walk-in.

Do you manufacture your jewellery?

Many of our pieces are made and finished by our experienced in-house jewellers, while others are produced through trusted manufacturing partners. Every piece is quality checked before it reaches you.

Do you deliver Australia-wide?

Yes. In-stock items are dispatched from our Gold Coast showroom within one to three business days by Australia Post Express, with tracking, transit insurance and signature on delivery.