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 * 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 * 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
Unique Engagement Ring Styles

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 04 to Aug 08
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

Frequently Asked Questions About Lisa Robin Engagement Rings

Lisa Robin designs custom and made-to-order engagement rings across every major style — solitaire, halo, hidden halo, side stone, three stone, cluster, bezel, east-west, vintage, and twist. Each design can be set with a colorless diamond, a colored diamond, or a colored gemstone, in any shape, in 14K gold or platinum.
Settings in this collection start at $2,095. Paired with a 1 carat lab grown diamond center, a starting engagement ring is approximately $2,995. Final pricing depends on the design, the metal, and the diamond or gemstone you choose. Colored gemstone pricing varies by gem type, color, and origin, which we discuss during the design process.
Yes. You can personalize any design online — diamond, metal, and finger size — or book a private design appointment by Zoom, phone, or in studio to modify a design or create one from scratch. Lisa guides you through the process and you see renderings of your ring before it is crafted.
Yes—every Lisa Robin ring can be personalized with your choice of diamond, setting, and metal. We also offer full custom design for a one-of-a-kind piece.
Each ring is made to order and ready in approximately 3-4 weeks from the time your design is approved.
Both are real diamonds with identical physical and optical properties. A lab grown diamond is created in a controlled setting and generally lets you reach a larger or higher-quality diamond for the same budget. A natural diamond forms over geologic time. The choice is yours.
It depends on how you want the diamond to sit on your hand. A solitaire puts the diamond first; a halo makes it read larger; a hidden halo adds sparkle only seen from the side; a bezel gives the most secure, modern line; a cluster or twist makes a more individual statement. Because every design is hand-crafted to your diamond, you can pair most styles with most shapes.
All four — 14K yellow, white, and rose gold, and platinum — wear well for daily use. White gold and platinum give the brightest, most neutral backdrop for a diamond. Yellow and rose gold add warmth around the center. The best choice is the tone you want to see on your hand.
Yes. If you love a design as it is, you can select your diamond, metal color, and finger size and complete your order online. An appointment is only needed if you want to modify a design or create something fully custom.
Every ring is made in the USA — designed in our private studio in Dayton, Ohio, and hand-crafted in our New York workshop. We serve couples nationwide through virtual appointments, and in person in Dayton.
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