Shown in 1.5 Carat
Shown in 1.5 Carat * Katharine six-prong knife-edge 1.5 carat round diamond solitaire engagement ring in 14k yellow gold by Lisa Robin
Shown in 1.5 Carat
Shown in 1.5 Carat * Katharine six-prong knife-edge 1.5 carat round diamond solitaire engagement ring in 14k white gold by Lisa Robin
Shown in 1.5 Carat
Shown in 1.5 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.5 Carat
Shown in 1.5 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.5 Carat
Shown in 1.5 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.5 Carat * Katharine six-prong knife-edge 1.5 carat round diamond solitaire engagement ring in 14k yellow gold by Lisa Robin
Shown in 1.5 Carat * Katharine six-prong knife-edge 1.5 carat round diamond solitaire engagement ring in 14k white gold by Lisa Robin
Shown in 1.5 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.5 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.5 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Shown in 1.0 Carat * The Katharine Solitaire Engagement Ring | Lisa Robin
Solitaire Engagement Rings

The Katharine Diamond Solitaire Engagement Ring

The Katharine is a classic solitaire engagement ring defined by a six-prong tiara setting and a bold 3mm knife-edge band — a setting that holds your center diamond with crown-like reverence and a band that adds its own line of light to the design. A round solitaire engagement ring built around lift and luminosity.
$ 2,495.00
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The Katharine's six-prong tiara setting lifts your center diamond higher than a four-prong solitaire and creates crown-like symmetry around it — more light through the facets, more presence above the band. The 3mm knife-edge band tapers to a fine ridge along its outer surface, catching light independently of the center diamond, so the band itself feels luminous even in quiet moments.

Metal Options 14K Yellow Gold, 14K White Gold, 14K Rose Gold, or Platinum. Sustainably sourced.
Style Solitaire engagement ring
Setting Six rounded prongs
Band 3mm
Setting Height High
Band Profile Bold modified knife edge
Crafting Time Approximately 3-4 weeks

Setting starts at $2,495. Paired with a 1 carat lab grown diamond center, the Katharine diamond solitaire engagement ring starts at approximately $3,395.

What is a knife-edge band and what does it do for the ring?

A knife-edge band rises to a fine ridge along the center of its outer surface, like the edge of a blade, rather than being flat or rounded. That ridge catches light along the length of the band, so the Katharine's 3mm band stays luminous on its own — adding sparkle from the metal itself, independent of your center diamond.

Why does the Katharine use six prongs rather than four?

Six prongs form a tiara-like setting that lifts your center diamond higher and surrounds it with crown-like symmetry. The extra prongs hold the diamond more securely and let more light through its facets from the sides, while reading as more ornamental than the cleaner four-prong look.

How is a classic solitaire different from a contemporary or minimalist solitaire engagement ring?

A classic solitaire like the Katharine adds traditional detail — here a six-prong tiara head and a knife-edge band — for a more ornamental, elevated presence. A minimalist solitaire strips those elements back to a plain band and simple head, keeping the focus entirely on the diamond. Both center a single diamond; the difference is how much the setting speaks alongside it.

Our guided approach to customizing each ring with intention and clarity.

Every Lisa Robin ring is made to order, which means your design can be thoughtfully refined — even when ordering online. Whether you're adjusting a detail or evolving the design, we guide you through each decision to ensure the final piece feels cohesive and entirely yours.

Design Refinements can be explored after your initial order, with any pricing adjustments clearly outlined and approved before crafting begins.

Available refinement options include:

  • Adjusting the width or taper of the band
  • Modifying or adding side diamonds for additional detail or presence
  • Changing the prong style (claw, round, double prong, etc.)
  • Adjusting the number of prongs for both aesthetic and structure
  • Refining the basket design for a different profile or overall look
  • Selecting your preferred metal type and color
  • Adapting the design to better coordinate with a wedding ring
Made to order — Your diamond engagement ring ships in 3-4 weeks, approximately Aug 16 to Aug 20
Shipping costs calculated at checkout

The Katharine Diamond Solitaire Engagement Ring

A solitaire engagement ring is one of the oldest symbols in jewelry — a single diamond, held with complete focus, the way a singular love deserves to be held. The form has existed for centuries because it works.

The Katharine takes that symbol and gives it a more distinguished expression. The six-prong tiara setting crowns the center diamond with crown-like symmetry, lifting it higher and letting more light reach every facet. The 3mm knife-edge band adds its own line of brightness beneath, catching light independently of the diamond above. As a classic solitaire built around lift and luminosity, the Katharine reads as a round solitaire engagement ring of enduring composition — not a stripped-down minimalist version, but a fully realized one.

Wear it as something you'll notice every time you look down at your hand. The Katharine joins a Lisa Robin tradition of classic solitaire engagement rings designed to honor the form's history while making it meaningfully your own.

The Katharine Diamond Solitaire Engagement Ring
The Katharine Diamond Solitaire Engagement Ring

Design Process

The Lisa Robin Engagement Ring Design Experience

A thoughtful process designed to bring clarity and confidence to the creation of your ring.

Online Ordering

Begin your custom engagement ring through a guided online experience designed to bring clarity to each decision. From understanding diamond shapes to exploring engagement ring settings, the process is supported by in-depth educational resources throughout the site.

If you’d like to personalize your design, you can place your order at any time—we’ll follow up to refine the details and ensure everything aligns with your preferences.

Private Design Appointments

For a more collaborative experience, work with us one-on-one, either in person or virtually. Your engagement ring consultation is tailored to you—we guide you through each decision in real time, shaping your diamond engagement ring with clarity and intention.

Compare diamonds sourced from trusted suppliers around the world through the Lisa Robin Global Diamond Collection.

As you explore your engagement ring, you can review available diamonds by shape, proportions, and overall presence to select the one that best complements your design.

This approach gives you access to a broader range of diamonds, allowing your selection to align more precisely with your design, priorities, and budget.

We guide you through how each diamond interacts with your setting—so the final engagement ring feels balanced, intentional, and cohesive.

Both natural and lab-grown diamonds are available, giving you the flexibility to choose what feels right for you.

Before your ring is hand-crafted, you’ll review detailed CAD renderings created using your diamond’s exact dimensions.

Multiple views allow proportions, balance, and design details to be carefully considered—so you can feel confident in how your engagement ring design will come together before crafting begins.

If a wedding ring is selected within the same order, renderings will also show each ring individually and together, helping you understand how they pair and flow as a set.

Once your design is approved, your ring is hand-crafted specifically for you using carefully selected materials and ethically sourced diamonds.

Each ring is a made to order engagement ring, typically completed in approximately three weeks.

You can choose secure, fully insured shipping or private studio pickup. Throughout the process, we remain available to guide you—so you always know what to expect at every stage.

What our customers say about their Lisa Robin Engagement Rings

I wanted a classic round engagement ring and this is perfect. I love the six-prong setting on the round diamond. Thank you for helping my fiancé select the perfect diamond and ring! This was perfect to add to my custom Lisa Robin wedding stack. I love it!

Mary Katherine & Adam
Nashville TN

I loved working with Lisa Robin! It was so easy to create exactly what I wanted. With some minor changes to Lisa's gorgeous styles, I had the perfect wedding ring to coordinate with my Lisa Robin Engagement Ring. Can’t wait to add another ring to my stack.

Abby & Zane
Blountville TN

More about Lisa Robin solitaires

A solitaire engagement ring is any engagement ring with a single center diamond and no side diamonds. The setting style can vary widely — classic four-prong, bezel, east-west, twist, hidden halo, or a band with scattered diamond accents — but the defining feature is one center diamond with no diamonds set beside it. The differentiator is the absence of side diamonds, not the prong configuration.
Solitaire engagement ring settings start at $2,095. A 1 carat lab grown diamond adds approximately $900, bringing most solitaires to around $2,995 fully crafted. Natural diamonds, larger carat weights, and colored diamonds price independently. We share itemized quotes so you see exactly what each component costs.
Yes. A solitaire is defined by having one center diamond and no side diamonds — not by how the diamond is held. A bezel-set ring with no side diamonds is a solitaire. So is an east-west, twist, or hidden halo design with no side diamonds. These rings cross-list in their setting-style collections too, but they belong here first.
Every shape works in a solitaire — round, oval, emerald, princess, marquise, pear, cushion, asscher, and radiant. Round is the classic choice. Oval and emerald are the most-requested elongated shapes. Marquise and pear flatter long fingers. Princess, cushion, asscher, and radiant offer modern or vintage architectural feels. We help you pick the shape that fits your hand and your style.
Yes. The Allison and Polaris settings are available with sapphire, ruby, emerald, aquamarine, morganite, yellow diamond, blue diamond, green diamond, pink diamond, and champagne diamond centers. We can also build any of our solitaire designs around a colored diamond or gemstone you'd like to feature — book a private design appointment to discuss options.
3–4 weeks from the day your order is finalized. Diamond selection, CAD review, casting, setting, and inspection happen in that window. We keep you in the loop at every stage and share photos at key milestones if you'd like.
Yes. Every solitaire can be made in 14K yellow, white, or rose gold or platinum, with the diamond shape, carat weight, and quality of your choice. We also build fully bespoke solitaires for couples who want something not in the standing collection — book a private design appointment to start.
It does — visibly. A halo of small diamonds around the center diamond extends the visual footprint of the setting, so a solitaire and a halo with identical center diamonds will read differently on the hand. The solitaire shows the diamond at its actual size; the halo amplifies it visually. Whether that's the right tradeoff depends on the diamond itself. A 1.5 carat solitaire reads substantial on its own; a 0.75 carat halo can read like a larger center. We discuss this directly when you're choosing between formats.
Both are real diamonds with identical chemistry, optics, and durability — you cannot tell them apart by eye or with a jeweler's loupe. The difference is provenance and price. Lab grown diamonds are about a quarter of the price of natural diamonds of the same specifications, which means a 1 carat lab grown is in reach for many couples where a 1 carat natural isn't. Most Lisa Robin couples choose lab grown for the larger carat weight it brings within reach in a solitaire, where the diamond carries the entire ring. We'll show itemized pricing on both before you decide.
Easily — that's part of the design intent. A solitaire engagement ring is the most flexible engagement ring shape for wedding ring pairing, working with straight bands, curved bands, eternity bands, and stacked combinations. Low-profile solitaires (where the diamond sits close to the finger) pair flush with most wedding rings. Higher cathedral solitaires lift the diamond up and forward, leaving more room beneath the diamond for a contoured wedding ring. We plan the wedding ring pairing during the engagement ring design — especially if you want both rings to read as one set.
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