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The Solitaire Diamond Necklace

Sale price1,600.00 NZD

Gold Karat:

Gold Karat

Gold Colour:

Gold Colour

Set in solid 9k Gold, this necklace features a 0.50ct IGI-certified lab grown diamond in a smooth bezel setting. The rounded gold rim keeps the profile clean and low against the skin, sitting easily beneath knitwear, tailoring or an open collar.

The pendant is solid gold through the back, with a smooth, closed, polished dome that is comfortable to wear and keeps the setting clean. Wear it on its own for a single point of light, or layer it with our delicate gold chain necklaces to build your own combination.

  • Total Carat Weight: 0.5 CT
  • Stone Class: Lab Grown
  • Cut: Round Brilliant
  • Cut Grade: Ideal
  • Clarity: VVS1 — An exceptionally high clarity grade, meaning the diamond contains tiny inclusions that are extremely difficult to see even under 10× magnification..
  • Colour: D — completely colourless and of the highest possible GIA grade
  • Polish: Excellent
  • Symmetry: Excellent
  • Fluorescence: None
  • Setting: Bezel
  • Metal: 9K Yellow Gold
  • Charm Dimensions: 7mm x 7mm x 4mm
  • Hoop Inner Diameter: 10mm
  • Construction: Solid
  • Chain Width: 1.35 mm Cable Chain
  • Chain Length: 45cm with 3 adjustment points from 40cm
  • Weight: ~3.34 g

New Zealand
Enjoy complimentary standard shipping on all orders.

Australia
Receive complimentary standard shipping on orders over $200 AUD. Orders over $1,000 AUD may incur customs duties or import fees upon arrival.

International
Shipping is automatically calculated at checkout based on your location. Orders over your country’s duty-free threshold may be subject to customs duties or import taxes upon delivery.

For more information on Shipping and Delivery, please click here

  • Wear & Storage: Designed for continuous daily routines. When traveling or storing your piece overnight, fasten the clasp. Place the gold pendant in one side of your BY TONIN pouch and keep the chain and clasp in the other side to avoid tangling and scratching.
  • Cleaning & Refreshing: Wipe the pendant and chain gently with a clean, soft microfibre cloth. No soaking, harsh chemicals, or special cleaning kits required.

For comprehensive care instructions, please visit our Product Care page.

Our 14K and 18K solid gold pieces are made specifically for you and crafted to order. All custom pieces are final sale and cannot be returned, exchanged, or refunded.

For details on returns, exchanges, and warranties, please see our Returns and Exchange Policy, and Warranty Policy.

Need help? Visit our FAQs or Contact us.

Lab grown diamond necklace NZ: BY TONIN 0.5ct solitaire gold pendant necklace worn with open collar shirt.
The Solitaire Diamond Necklace


The Solitaire Diamond Necklace

IGI Certified Conscious Diamonds

Featuring the highest D colour grade and exceptional VVS1 clarity, each diamond delivers an unmistakably colourless appearance, exceptional visual purity, and captivating brilliance.

360-Degree Solid Gold Casting

Cast completely solid without open cavities or hollowed backs, the reverse side is hand-finished into a smooth gold dome.

Classic Bezel Setting

Finished with a softly pillowed bezel in solid gold, the stone is completely enclosed within a smooth, seamless setting that feels as beautiful as it looks.




Pair it with

The Solitaire Diamond Drop Earrings

From $2,200 NZD

The Solitaire Diamond Earrings are drop hoops in solid gold, pairing a classic hoop with an articulated, bezel-set round lab grown diamond that moves with the ear.

Discover

The Solitaire Diamond Bracelet

From $1,300 NZD

The Solitaire Diamond Bracelet is a bezel-set lab grown diamond bracelet in solid gold, designed as an easy foundation for wrist stacking and made to move comfortably with you.

Discover

Made To Order Confirmation

    This piece is made especially for you. Please allow 4–6 weeks for handcrafted production and delivery. Final sale terms apply in accordance with our bespoke returns policy.

THE DIAMOND GUIDE

Carat (abbreviated as 'ct') measures a diamond's physical weight rather than its visual diameter. One carat is equal to exactly 200 milligrams. While carat weight influences value, two diamonds of the exact same weight can look completely different depending on their proportions.

Does carat size matter?

Carat weight determines a stone's mass, but the way a diamond is cut dictates how it actually appears on the skin. A precise, well-proportioned cut maximizes the surface diameter and light return. This ensures that even smaller, more delicate weights—like a 0.2-carat stone—appear clean, bright, and distinct.

Clarity evaluates the internal characteristics (inclusions) and surface markings (blemishes) created during the diamond's growth process. The scale ranges from Flawless (FL) down to Included (I3).

What are the most valuable clarity grades?

The most valuable diamonds are those graded Flawless (FL) and Internally Flawless (IF). These stones contain absolutely no internal inclusions or surface blemishes under 10x magnification, representing the highest tier of structural purity.

Right below these rare classifications sit VVS (Very, Very Slightly Included) diamonds. Because their internal characteristics are completely microscopic, VVS stones offer an identical appearance of total visual purity to the naked eye, making them a practical choice for high-quality everyday wear.

What is the impact?

Clarity determines the visual purity of the stone. Our diamonds are graded VVS (Very, Very Slightly Included), meaning any internal characteristics are entirely microscopic and invisible to the naked eye. This ensures the diamond remains clear and free of visible imperfections in daily wear.

Colour measures the natural tint present within a white diamond. The industry standard scale established by the GIA runs alphabetically from D, representing completely colourless, down to Z, which indicates a noticeable light yellow or brown tint.

The Essential Diamonds are in the F–G range for their clean, bright appearance.

What are the most valuable colour grades?

The most valuable diamonds are those graded D, E, and F. These are completely colourless stones, prized because they have no trace of tint, allowing them to reflect light with absolute purity.

What is the impact?

Subtle shifts in colour tone directly alter how bright a diamond looks once set. While completely colourless stones are the rarest, diamonds in the near-colourless (G–H) range offer identical visual clarity to the naked eye when worn, making them a practical choice for everyday jewellery. 

Cut refers to the precision, alignment, and polish of a diamond’s facets. It dictates how light enters the stone and reflects back to the eye, rather than referring to the raw shape of the stone itself.

What are the most prized cut grades?

The most prized diamonds are those graded Excellent. This grade represents the highest level of cutting precision, where the facet angles and symmetry align perfectly to reflect light with absolute efficiency, preventing any dullness or leakage.

Does cut matter more than carat size?

A diamond’s appearance on the skin relies on the balance of all 4 Cs, with cut playing the most critical role. For a round cut diamond, we select precise, well-proportioned cuts that maximize the surface diameter and light return. This ensures that even smaller, more delicate weights appear clean, distinct, and bright.

Close-up of a hand wearing two gold rings: one with a round brilliant-cut diamond in a bezel setting, and the other with a rectangular baguette-cut diamond. Custom rings designed in NZ by BY TONIN.


Materials and care

What is the Solitaire Collection made from?

Each piece is crafted in 9ct solid gold and set with a lab-grown diamond. Solid gold means the metal is gold alloy all the way through, so there is no plating to wear away.

Lab-grown diamonds are real diamonds, with the same chemical, physical and optical properties as mined stones.

How is the diamond set?

The diamond is bezel set, held in a smooth metal rim that wraps around the stone. It sits low and secure, and the rim helps protect the edge of the diamond from knocks and snags, which makes it easy to wear every day.

Can I choose a different metal, stone or carat weight?

Yes. If you'd like a different material, such as white gold, 14ct or 18ct gold, a larger carat weight, or a gemstone like emerald or sapphire, get in touch with us and we'll talk you through the options.

You can also explore our Bespoke Service.

Can I wear it every day?

Yes, it's made to be worn often. Solid gold and diamond are both durable. Still, we recommend taking it off before swimming, heavy lifting, exercise and household cleaning, and putting it on after perfume, lotion and hairspray.

Does solid gold tarnish?

Only 24ct gold is pure enough to stay free of tarnish. Gold below 24ct, including our 9ct, is mixed with other metals for strength, and 9ct is 37.5% gold, with the rest made up of alloy metals.

Over time, those metals can react with air, moisture, sweat, skin oils, cosmetics and chemicals, and your piece may develop a soft patina. This is a natural part of wearing solid gold jewellery and only affects the surface. A gentle clean and a soft polishing cloth will bring back its shine.

How do I clean it?

Your piece only needs a gentle polish with a soft jewellery polishing cloth. Wipe it after wearing to remove oils and restore its shine, and avoid harsh chemicals and abrasive cleaners.

Ethical sourcing

Where does the diamond come from?

The diamond is lab-grown, created using technology that replicates the conditions in which diamonds form naturally. All of our materials are conflict-free and sourced from Responsible Jewellery Council accredited suppliers.

Is solid gold a sustainable choice?

Solid gold is made to last. It's gold alloy all the way through, so it will not wear away and no base metal underneath to show through. It also doesn't rust or corrode, and over time it may develop a soft patina that a gentle polish with a soft cloth brings back to its shine. Because it holds up to everyday wear, you're not replacing it when a finish fades, which means fewer pieces made and fewer thrown away.

Our gold is sourced from Responsible Jewellery Council accredited suppliers, and each piece is made in small batches with a manufacturing partner that has certified ethical standards.

Choosing a piece you'll wear and love for a long time is one of the simplest ways to buy more sustainably.

Is a lab-grown diamond a sustainable choice?

Lab-grown diamonds offer a more traceable way to own a diamond. They're grown in a controlled laboratory rather than mined, so there's no large-scale excavation of land, and each stone can be traced back to where it was made. Each diamond grows from its own tiny diamond seed, then is individually cut, polished and graded, so every stone has its own character.

We pair it with solid gold and make each piece in small batches with a manufacturing partner that has certified ethical standards. Diamond and solid gold are both made to last, so your piece is designed to be worn often and kept for years.

Gifting

Does the Solitaire Collection arrive gift-ready?

Yes. Every piece arrives in our FSC® certified jewellery box with a velvet pouch, finished with a bow and ready to gift to yourself or someone you love. You can also add a personal handwritten note on the product page, and we'll include it with your order.

Can I add a personal note?

Yes. Add your message on the product page and we'll handwrite it and include it with the order.

How will my gift be delivered?

Orders are dispatched from Auckland the next business day, and New Zealand delivery usually takes 1–3 working days via NZPost. Solitaire Collection orders are sent signature required, so someone will need to be available to receive the parcel. If you're sending it as a surprise, choose a delivery address where someone can sign for it, such as a workplace.

Can I send it directly to the recipient?

Yes. Enter their address as the delivery address at checkout, and add a handwritten note so it arrives with your message. Just make sure someone will be there to sign for it.

What if my gift isn't quite right?

We offer returns and exchanges within 30 days of purchase for unworn items in original condition. Please contact us first, then send the piece back to us within that window. Items can be exchanged once.

For hygiene reasons, earrings can't be returned or exchanged, and bespoke pieces are made to order, so they aren't eligible either. See our Returns & Exchanges page for the full policy.

Necklace Collarbone Close-Up View
Diamond necklace in solid gold: BY TONIN 0.5ct solitaire lab grown diamond pendant necklace on model, buy fine jewellery NZ.

Quality, Considered

Designed for longevity, with quality craftsmanship backed by our warranty.

Designed in New Zealand

Ethically sourced materials with a focus on quality, careful craftsmanship.

Conscious Luxury

Timeless jewellery, thoughtfully crafted in small batches for a pearmanent collection.

Beautifully Presented

Beautifully packaged for a refined unboxing experience.