ADTC

What ADTC does

ADTC (Australian Diamond Trading Corporation) is a privately held, second-generation Australian family business founded in 1986 in Melbourne that operates as a wholesale supplier of diamonds and gemstones to retail jewellers across Australia. The company positions itself as Australia's leading diamond supplier, claiming the largest on-hand range of premium white and coloured diamonds in the country across 12 cut shapes (Round, Cushion, Square Cushion, Radiant, Princess, Asscher, Emerald, Baguette, Pear, Marquise, Oval, Heart), with all stones hand-selected, colour graded in-house, and accompanied by GIA, HRD, and IGI certification. Its core operational capability is physical — sorting, sieving, and calibrating parcels at 0.05mm precision — and the company holds Authorised Argyle Partner status providing access to Argyle-sourced Australian coloured diamonds.

ADTC's business model is B2B wholesale on an account-gated basis: jewellers must apply for an account to access the stock portal and pricing, and the company supports nationwide distribution through overnight delivery. The revenue stream is one-time wholesale transactions on diamonds and gemstones, supplemented by a secondary product line of finished jewellery and semi mounts designed in Australia and manufactured in Thailand for cost efficiency. Pricing is not publicly disclosed and is offered only to approved trade accounts. There are no funding events, M&A activity, leadership changes, or public financial disclosures in the available data, consistent with its status as a closely held family business operating in a niche specialist wholesale role with 1-10 employees.

The go-to-market is sales-led and account-based, with no consumer-facing marketing, no app presence, and no public social media footprint documented. Distribution is purely domestic within Australia, and ADTC sources globally through long-standing supplier relationships but does not appear to serve customers outside Australia. No AI, digital platform, or technology-product narrative is present — the company is fundamentally a physical-goods wholesaler with light digital commerce infrastructure.

Name

ADTC

Legal name

Australian Diamond Trading Corporation

Website

https://adtc.com.au

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

1–10 employees

Short description

ADTC is a privately held, second-generation Australian family-owned wholesale diamond and gemstone supplier founded in 1986, serving retail jewellers nationwide with the largest claimed on-hand inventory of certified white and coloured diamonds in Australia via an account-based stock portal and overnight delivery.

Ownership category

akta.pro rank

Product category

Diamond Wholesale Distribution

NAICS

Jewelry, Watch, Precious Stone, and Precious Metal Merchant Wholesalers (42394)

SIC

Wholesale-Jewelry, Watches, Precious Stones & Metals (5094), Jewelry, Silverware & Plated Ware (3910)

akta.pro industry

PRIMARYCRAKAAAJ

Fine Jewelry Components (Chains, Settings, Findings)

Consumer Products & Retail/Jewelry, Watches & Luxury Accessories/Fine Jewelry (Precious Metals & Gemstones)

Keywords

• Diamond wholesale supply
• Loose diamond supplier
• Coloured diamonds wholesale
• Jewellery wholesale supply
• Diamond grading and certification

Headquarters

HQ city

Melbourne

HQ country

Australia

HQ region

Oceania

Markets served

GTM type

B2B

Offering type

Services

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Technology or R&D

Revenue model

1. Diamond and Gemstone Wholesale: B2B wholesale supply of diamonds and gemstones to jewellers. The company sources highest quality diamonds at competitive prices as an independent supplier and offers a large selection of on-hand stock readily accessible to clients.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

ADTC is a wholesale supplier of premium white and coloured loose diamonds and gemstones to retail jewellers across Australia. All stones are hand-selected and colour graded in-house, accompanied by GIA, HRD and IGI certification, with parcels sorted, sieved and calibrated to 0.05mm precision. The company distributes inventory through an account-based online stock portal with overnight delivery, and additionally supplies finished jewellery and semi-mounts designed in Australia and manufactured in Thailand.

Product overview

ADTC (Australian Diamond Trading Corporation) operates as a single unified offering centered on premium diamonds and gemstones. The core product portfolio includes white and coloured diamonds in 12 distinct cuts (Round, Cushion, Square Cushion, Radiant, Princess, Asscher, Emerald, Baguette, Pear, Marquise, Oval, and Heart), supplemented by jewellery and semi mounts designed in Australia and manufactured in Thailand. All diamonds are hand-selected, colour graded in-house with GIA, HRD, and IGI certification, and calibrated at 0.05mm precision. As an Authorised Argyle Partner, ADTC also provides access to Argyle coloured diamonds. The company offers overnight delivery and account-based access through its stock portal.

Differentiator

Problem solved

Functional benefit

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• ArgylecoreStrategic or Co-development PartnerADTC is an Authorised Argyle Partner. This partnership provides access to prestigious Australian diamonds from the Argyle mine region, a globally recognised source of coloured diamonds including pink diamonds. The relationship enables ADTC to offer exclusive Australian-sourced stones to their client base of jewellers nation-wide.

Scale indicators3 records

Recent moves4 records

Expansion highlights3 records

Direct peers

• KGK Group: Global B2B diamond manufacturer and wholesaler headquartered in India, sourcing and supplying certified diamonds to retailers worldwide. Directly comparable to ADTC as a wholesale diamond supplier serving jewellery retailers, though at significantly larger scale.
• Rosy Blue NV: Vertically integrated diamond manufacturing and trading company with global operations, supplying polished diamonds to retailers and wholesalers. Directly comparable as a B2B diamond wholesaler with international sourcing and broad cut assortment.
• Diarough N.V. Global diamond manufacturer and supplier of polished diamonds across all major sizes and qualities. Comparable to ADTC as a wholesale diamond distributor serving jewellery retailers, with a broader international footprint.
• Hari Krishna Exports Pvt. Ltd. One of the world's largest diamond manufacturing and exporting companies, supplying certified polished diamonds globally. Comparable to ADTC as a B2B diamond wholesaler with multi-certification quality control (GIA/IGI/HRD-style grading).

Broad incumbents

• De Beers Group: The world's largest rough diamond producer and a broad incumbent in the diamond value chain, with downstream brands such as Forevermark. Overlaps with ADTC in certified diamond supply to retailers but operates at mining, branding, and global wholesale scale far beyond ADTC's niche.
• Rio Tinto Diamonds: Owner and operator of the Argyle diamond mine and a major global diamond producer. Directly relevant to ADTC given ADTC's Authorised Argyle Partner status; comparable as a diamond industry incumbent, though at upstream mining scale rather than wholesale distribution.

Emerging players

• Leibish & Co. Specialist in natural fancy coloured diamonds with both retail and wholesale operations. Comparable to ADTC's coloured diamond offering (including Argyle-sourced stones) but operates at a smaller, more specialised scale with an online-first model.
• Blue Nile (Signet Jewelers): Online diamond and fine jewellery retailer, now part of Signet Jewelers, offering certified loose diamonds direct to consumers and trade accounts. Comparable to ADTC's certified diamond offering via a digital-first, lower-overhead model that competes for the same jeweller and end-customer wallet.

Regional players

• Dhamani Jewels: UAE-based luxury gemstone and diamond group with global retail presence including Asia-Pacific markets. Comparable to ADTC's premium certified diamond wholesale positioning, but serving different geographies (Middle East/Asia) and operating at significantly larger scale.

Others

• James Allen (Signet Jewelers): Online diamond retailer with a strong trade programme, owned by Signet Jewelers. Not a direct competitor but thematically relevant as a digitally native certified-diamond platform reshaping jeweller sourcing expectations.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/adtc

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ADTC