Natural Loose Pink Diamonds

A loose pink diamond is a natural fancy colour diamond that has not yet been set into any jewellery. Purchasing a stone in its loose form allows you to inspect it from every angle, cross-reference it directly against its grading certificate, and evaluate all four Cs — colour, clarity, cut, and carat — with complete transparency. It is the preferred choice for discerning buyers who want full control over quality and personalisation, whether they are creating a bespoke engagement ring, adding to a jewellery collection, or acquiring a stone as a tangible asset. Browse our finished pink diamond ring collection or contact us to begin a custom design.

Natural pink diamonds account for less than 0.01% of all diamonds mined worldwide — making them among the rarest gemstones on earth. Unlike yellow diamonds, whose colour comes from nitrogen, the pink hue in natural pink diamonds is believed to result from extreme geological pressure causing a structural deformation of the crystal lattice — a process that is still not fully understood by scientists.

Their rarity was further compounded by the closure of the Argyle Mine in Western Australia in 2020, which had been responsible for over 90% of the world's pink diamond supply. With no comparable replacement source identified, the global supply of natural pink diamonds is now effectively fixed, and prices have risen sharply as a result. Acquiring a certified loose pink diamond today means owning a stone whose supply can only diminish over time.

Pink diamonds are graded by the GIA (Gemological Institute of America) on a colour intensity scale that runs from Faint Pink → Very Light Pink → Light Pink → Fancy Light Pink → Fancy Pink → Fancy Intense Pink → Fancy Vivid Pink / Fancy Deep Pink. The deeper and more saturated the colour, the rarer and more valuable the stone.

In addition to intensity, the GIA also evaluates the colour modifier (hue). The most desirable pinks are described as Pure Pink or Purplish Pink, while modifiers such as Orangy Pink or Brownish Pink generally command lower premiums. A stone described as Fancy Vivid Purplish Pink represents the pinnacle of the category and is among the most sought-after gemstones in the world. Each stone in our collection comes with a full GIA or CGL grading report detailing all of these characteristics.

Buying loose offers several distinct advantages over purchasing a pre-set piece:

Total transparency — You can inspect the entire stone including the pavilion and girdle, areas that are concealed once set. This makes it far easier to assess inclusions, colour distribution, and overall quality.

Better value for money — Pre-set jewellery includes labour, design, and brand margins on top of the stone's cost. A loose diamond gives you more stone for your budget.

Full customisation — Choose your own setting style, metal (PT950 platinum, 18K rose gold, yellow gold, white gold), and design to create a truly unique piece.

Investment clarity — A certified loose stone is easier to value, resell, or reinsure independently, making it a cleaner asset than a mounted piece where the stone and setting values are intertwined.

Yes. Every loose pink diamond we offer is accompanied by an official grading report from the GIA (Gemological Institute of America) or CGL (Central Gem Laboratory) — the two most respected gemological authorities in the world. The certificate independently verifies the stone's colour grade, colour modifier, clarity, carat weight, cut, polish, symmetry, and fluorescence. For Argyle-origin stones, an Argyle Certificate of Authenticity may also be included, further confirming the stone's provenance and adding to its collectability and resale value.

Natural pink diamonds — particularly those graded Fancy Intense or Fancy Vivid — have demonstrated exceptional long-term value appreciation and are widely regarded as one of the most compelling tangible alternative assets available. Key investment factors include:

Fixed and declining supply — With the Argyle Mine closed and no replacement source confirmed, the number of high-quality pink diamonds available to the market can only decrease over time.

Growing global demand — Collector and investor interest from Asia, the Middle East, and beyond continues to accelerate.

Portability and privacy — A significant store of value in a compact, private, and internationally liquid form.

Inflation resilience — Rare physical assets have historically held their value during periods of currency devaluation and market volatility.

As with all investments, we recommend consulting a qualified financial adviser. However, the fundamental supply and demand dynamics for natural pink diamonds are uniquely compelling.

The ideal metal depends on how you want the stone's colour to appear:

18K Rose Gold or Pink Gold — The most popular choice for pink diamonds. The warm blush tone of the metal harmonises beautifully with the stone, creating a romantic and unified aesthetic.

Platinum (PT950) — Creates a cool, high-contrast backdrop that allows the pink colour to stand out with striking clarity. Extremely durable and hypoallergenic.

18K White Gold — A more affordable alternative to platinum with a similar effect, ideal for buyers who want the colour contrast without the premium.

18K Yellow Gold — Less traditional for pink diamonds but can create a warm, vintage-inspired look.

For setting styles, a prong solitaire maximises light return and colour visibility, while a halo setting amplifies the perceived size and intensifies the colour. Our team is happy to guide you — book a consultation to explore your options in person.

Absolutely. A loose pink diamond is the ultimate foundation for a truly one-of-a-kind engagement ring or special jewellery piece. Once you have selected your stone, our team will guide you through every aspect of the design process — from setting style and metal choice (PT950 platinum, 18K rose gold, yellow gold, and more) through to final craftsmanship. Whether you have a clear vision or are starting from scratch, we will bring it to life. To begin, contact us or visit our private Tokyo showroom. You can also explore our ready-to-wear pink diamond ring collection for design inspiration.

Yes, and we strongly recommend it. The colour of a natural pink diamond shifts beautifully under different lighting conditions — from daylight to incandescent light — and no photograph or screen can fully capture this. At our private Tokyo showroom, one of our specialists will present the stone under both natural light and professional gemological lighting, walk you through the grading report in detail, and help you compare stones side by side. Viewings are by appointment only. Please use our contact form to reserve your private session.

Yes. Weiss offers a money-back guarantee on our loose diamonds and jewellery. Purchasing a rare pink diamond is a significant decision, and we want every customer to feel completely confident from the moment they enquire to long after they receive their stone. Full terms and conditions are outlined on our Money-Back Guarantee page. If you have any questions before committing, please do not hesitate to get in touch — we are here to help.