Gemstone Sourcing
From the depths of Colombian emerald mines to the auction houses of Geneva — Nathan's global network delivers the world's rarest stones directly to you.
Our Approach
Mine to Masterpiece.
Every Stone Has a Story.
With over 30 years of knowledge and deal-making expertise, Nathan travels personally to the world's most significant gem-producing regions and international trade fairs — Hong Kong, Basel, Las Vegas, Tucson, Jaipur — and maintains direct relationships with mine operators, cutters, and certified dealers from Colombia to Lightning Ridge. This ensures every stone is ethically sourced, expertly graded, and acquired at the best possible value for our clients.
Global Network
Direct mine & dealer relationships
Certified
GIA, Gübelin & SSEF reports
Bespoke Search
We find exactly what you need
Origin Verified
Full provenance documentation
The World's Finest
Rare & Precious Gemstones
Lightning Ridge, NSW, Australia
Australian Black Opals
The crown jewel of Australian gemstones. Lightning Ridge black opals display the most vivid play of colour in the gem world — electric reds, greens, blues, and purples dancing against a dark N1-N4 body tone. Nathan has sourced from Lightning Ridge for 25+ years, working directly with multi-generational mining families to secure the finest specimens before they reach the open market.
Key Characteristics
Harlequin & broadflash patterns
Red-on-black (most valuable)
N1-N4 dark body tone
Each stone entirely unique — no two alike
Paddar Region, Jammu & Kashmir, India
Kashmir Sapphires
The most valuable blue gemstones on Earth. Kashmir sapphires possess a legendary 'velvety' cornflower blue caused by micro-inclusions of rutile silk — a quality found nowhere else. The mines were discovered in 1881 and effectively exhausted by the 1930s, making every Kashmir sapphire a finite treasure with values appreciating 300-800% over the past two decades.
Key Characteristics
Legendary velvety 'Kashmir effect'
Cornflower blue — unmistakable
Mines exhausted since 1930s
GIA/Gübelin/SSEF origin reports essential
Ural Mountains, Russia / Hematita, Brazil
Alexandrite
The ultimate colour-change gemstone. Fine alexandrite shifts from vivid green in daylight to rich purplish-red under incandescent light — a phenomenon caused by chromium absorption. Originally discovered in 1830 in Russia and named after Tsar Alexander II, the finest Russian specimens with strong colour change are among the rarest gems on Earth.
Key Characteristics
Green → red colour change
Russian origin most prized
Hardness 8.5 — extremely durable
5ct+ specimens are museum pieces
Merelani Hills, Mt Kilimanjaro, Tanzania
Investment Tanzanite
The world's only single-source gemstone with an estimated 30-year supply remaining. Investment-grade tanzanite — vivid violetish-blue, eye-clean, 5ct+ — has appreciated 200-400% since 2005. When the Merelani deposit is exhausted, no more tanzanite will ever be mined, making it a true 'generation stone' for collectors and investors alike.
Key Characteristics
Single source — finite global supply
Trichroic: blue, violet & burgundy
AAA+ grade for investment
200-400% appreciation since 2005
Muzo & Chivor Mines, Colombia
Colombian Emeralds
The world's most prized emeralds — vivid green with exceptional clarity. Nathan sources directly from trusted Muzo mine operators, ensuring each stone meets the exacting standards of colour saturation and transparency demanded by haute joaillerie.
Key Characteristics
Vivid green saturation
Jardin (garden) inclusions
Three-phase inclusions unique to Colombia
Oil treatment assessment
Mogok Valley, Myanmar
Burmese Rubies
Pigeon-blood rubies from the legendary Mogok Valley remain the pinnacle of ruby collecting. These stones exhibit a fluorescent red glow that sets them apart from every other origin — a quality that commands premiums at international auction.
Key Characteristics
Pigeon-blood red colour
Strong fluorescence
Silk inclusions
Heat treatment certification
Ratnapura, Sri Lanka
Ceylon Sapphires
Sri Lanka's Ratnapura — the 'City of Gems' — produces sapphires of extraordinary cornflower blue. Nathan's relationships with Sri Lankan dealers span over a decade, granting access to stones before they reach the open market.
Key Characteristics
Cornflower blue hue
Excellent brilliance
Natural unheated specimens available
Padparadscha variants
Paraíba & Rio Grande do Norte, Brazil
Paraíba Tourmalines
The neon-blue glow of Brazilian Paraíba tourmalines is caused by trace amounts of copper — a phenomenon found nowhere else on Earth. These stones are so rare that a single carat of fine quality can exceed the value of a comparable diamond.
Key Characteristics
Neon blue-green glow
Copper-bearing chemistry
Brazilian vs African origin certification
Exceptional per-carat value
Argyle Mine, Western Australia (Closed 2020)
Argyle Pink Diamonds
With the Argyle mine now permanently closed, natural pink diamonds have entered an era of unprecedented scarcity. Nathan holds relationships with private collectors and dealers who still hold certified Argyle stones — making each acquisition a once-in-a-lifetime opportunity.
Key Characteristics
Natural fancy pink to vivid pink
Argyle certification
Investment-grade appreciation
Mine closed — finite global supply
Pinctada maxima — Australia, Indonesia, Philippines
South Sea Pearls
The queen of pearls. Australian South Sea pearls — white, silver, and golden — are the largest and most lustrous cultured pearls in the world. Nathan sources matched pairs and graduated strands directly from pearl farms in Broome and the Arafura Sea.
Key Characteristics
15–20mm diameter
Exceptional nacre thickness
White, silver, champagne & deep gold
Matched pair availability
The Process
From Your Vision to Your Hand
01
Tell Us What You Seek
Describe the gemstone you're looking for — type, colour, size, budget. The more detail, the better.
02
We Search Globally
Nathan activates his global network — mine contacts, certified dealers, and auction houses worldwide.
03
Presentation & Selection
We present certified options with full provenance, grading reports, imagery, and pricing.
04
Design & Creation
Once selected, we move to bespoke design — crafting the perfect setting for your stone.
Gemstone Inquiry
Tell us what you're searching for and we'll research through our global contacts to find the perfect stone.