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Argyle Diamond Investments

We are NOT diamond brokers, we are as close to the source as humanly possible with a pink diamond inventory second to none.


Argyle Diamond Investments is as a tangible asset wholesale business, trading to the public and all aspects of the jewellery industry. We offer all our clients a start-to-end pink diamond investment solution. We are NOT diamond brokers, but a direct agent for one of the world’s largest Argyle authorised partners. Argyle Diamond Investments acquire Argyle pink diamond allocations 4 times a year, as well as the very rare Premium and Signature Tender diamonds. This assures you of the guaranteed highest quality, largest selection and lowest price.


ADI is owned and operated by Leonards Jewellers, who have been trading from the same location for over 80 years. But our diamond origin didn’t start then, it began back in 1812 in Paris France where our great-great grandfather was a prominent jewellery craftsman. He relocated his family in 1854 to Piccadilly London and opened Tessiers Jewellers where they are still operating to this day.

In the late 1920s our grandmother relocated to the largest industrial city in Australia, Newcastle. In 1932 she punchiest our Darby street building and opened for business. Today Argyle Diamond Investments is Australia’s leading pink diamond specialist, our clients consist of private investors, SMSF trustees, Wholesale Managed Funds, Financial Advice Groups and Family Offices. When it’s time to sell your investment, ADI have Australian largest selling platform, being the only pink diamond company that have the capacity to resell your diamond in a prompt timeframe with a guaranteed profit, providing the diamond was originally purchased though ADI.


Argyle Diamond Investments is located in the heart of Newcastle being Australia’s seventh largest city with the world’s largest coal exporting harbour and Australia’s premier university. It is located in the heart of the Hunter Region 160kms north of Sydney, bordered by a stunning coastline of beautiful beaches. Newcastle is ideally located to world-class wineries in the Hunter Valley; a world-heritage listed rainforest, Australia’s largest salt water lake and some of the world’s most famous horse studs.

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