Guaranteed Grading
The only laboratory in Australia offering a written full-replacement guarantee on every report.
Global Recognition
Credited by CIBJO, certified by IDC, and listed on RapNet and IDEX for international credibility.
Fully Independent
Privately owned and operated with no trade funding, influence, or conflict of interest.
Transparent Process
Every diamond is graded on-site in Sydney by qualified gemmologists, you can meet the team who grade your diamond.
Experience Diamond Grading Like Nowhere Else.
Meet Australia’s most trusted gemmologists, because at DCLA, expertise and transparency define every certification.
Step inside the nation’s only internationally accredited diamond grading laboratory and witness the precision behind every report.
At DCLA, your diamond never disappears into a distant facility.
Our Sydney-based experts welcome you to see the process firsthand, combining advanced technology, scientific rigour, and personal integrity to deliver certification you can trust for a lifetime.
Our Laboratory
DCLA team combines decades of gemmological experience
Every diamond certified by DCLA is examined by accredited gemmologists in our Sydney laboratory. Our team has been trusted by jewellers, insurers …
What We Do ?
Whether you’re buying, selling, or valuing a diamond, DCLA offers unmatched accuracy, transparency, and independence. As the only Australian lab accredited by CIBJO, listed on RapNet and IDEX, and entrusted with the nation’s official Diamond Masterset, DCLA sets the benchmark in global grading excellence.
Grade Diamonds
Trusted by jewellers, insurers and courts Australia and beyond. We certify both natural and lab-grown diamonds.
Value Jewellery & Precious Stones
Discover the true worth of your diamonds through internationally accredited grading and certification.
Buy or Sell with Confidence
Make informed decisions backed by independent, transparent assessments trusted by jewellers and investors worldwide.
Educate & Empower
Gain expert knowledge about diamond quality, grading, and value, empowering you to make smarter jewellery choices.
Legal, Insurance & Trade Services
Legal and Insurance
Our reports are recognised in Australian courts and by leading insurers. We provide expert testimony, loss assessments, probate valuations, and estate settlement support.
International Clients
DCLA accepts international submissions via secure courier
All certification is recognised globally.
We recommend Brinks or similar for international high-value parcels
Trade Partnerships
We partner with jewellers, retailers, and valuation professionals, offering bulk discounts, trade pricing, and long-term consultation services.
Client Testimonials
I just had the most wonderful experience buying a diamond. Michael helped me select it so that I got the best size and quality diamond for my budget. I was kept up to date throughout the whole purchase and during delivery.
Boyd Hore
Amazing team, Michael and Roy are the best guys. Honest, genuine and great to do business with. Great scotch collection too. Thanks again guys.
Alex Lambros
Dealt with Roy by recommendation, 100% professional, best Diamond Dealers in Australia. Will only deal with them again. Took a flight to Sydney just to see them and saved thousands, absolute quality and professional service. A+ guys!
Clive Guidi
Meet Our Experts
Discover the experienced and knowledgeable Founders behind DCLA success and outstanding customer service.
Michael Cohen
Founder
Roy Cohen
Founder
Dan Novick
Founder
Bruce Cohen
Founder
DCLA granted International Diamond Council Rules for Grading Polished Diamonds
The Diamond Certification Laboratory of Australia (DCLA), Sydney, Australia is proud to announce that[…]
Blog & News
Stay informed with expert insights, industry updates, and diamond education from Australia’s leading grading authority.
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Russia’s major diamond mining firms including Alrosa have urged[…]
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Happy Diwali
‘How to Buy a Diamond’ Workshop Registration Open
DCLA’s in-laboratory workshop on ‘How to Buy a Diamond’[…]