Every round cathedral diamond ring is designed and crafted by Plum to your exact specifications. Plum's ethically-sourced diamonds are 100% lab created and curated for quality. Our ring settings are made with the best materials available—including recycled metals whenever possible—and undergo stringent QA in our own certified-responsible manufacturing facility. We don't purchase or use inferior mass-produced mountings that can easily bend or break.

Measurements and carat weights are approximate. We craft rings to strict tolerances. However, keep in mind that all Plum rings are set, polished, and finished individually by hand, so slight variations are normal.

More about this cathedral engagement ring:

Claw prongs securely hold your center diamond.

Band width hand finishes to 2mm. NOTE: Bands with Channel and Bead and Bright Set diamond settings a slightly wider and finish to about 2.3mm.

Band depth hand finishes to 1.7mm.

Side diamond details and carat weights, based on a 2ct center diamond. Total carat weights are approximate:

Small accent diamonds are full-cut round brilliant lab grown diamonds graded F/G color, SI1+ clarity.

Regular diamond band: 14 x 1.7mm diamonds, total weight approx. .26ctw

Channel diamond band: 22 x 1.3mm diamonds, total weight approx. .22ctw

Bead and Bright Set diamond band: 20 x 1.2mm diamonds, total weight approx. .16ctw

Hidden halo: 12 x 1.1mm diamonds, total weight approx. .06ctw

Don't see exactly what you're looking for, want another center diamond shape, or some other customization? Contact us for adjustments! We can customize any ring. Send an email.

Rings take about 15 business days to craft from start to finish, and we will always contact you before shipping to coordinate your insured, overnight FedEx delivery. Your ring will arrive in an unmarked brown box.

In a rush? We do our best to meet special dates, and we can often expedite your order. Rush charges may apply. Please contact us to arrange.

Once your ring is complete, overnight shipping and returns are shipped FREE overnight, insured FedEx for all U.S. orders in the lower 48. You have 30-days to return or exchange your ring. For more information about our shipping and return policies including shipping to Alaska and Hawaii, we're breaking it all down here.

We offer a free resize within one year of your purchase and free sizing every year after that. We even cover shipping! If you're not sure what size you need, you can still place your order and we'll send you a sizer. Learn more here.

All of our rings come with free lifetime servicing that covers an annual spa treatment to keep your ring sparkling for years to come. This includes polishing, rhodium plating, pro cleaning, and general maintenance. Head to our warranty page for more info on ring maintenance and what's included.

Your diamond is laser inscribed with a unique number and comes with a grading certificate from either IGI or GIA. Please note, GIA-graded lab diamonds are usually issued an electronic certificate only, to cut down on waste. You will receive a QR code that links to your GIA documentation, which you are free to download. Let us know if you'd like us to print a paper copy for you.

Free on request for rings over $5,000: we will provide an appraisal with estimated replacement value for insurance purposes.

We offer ShopPay Installment plans that start at 4 payments as low as 0%*. ShopPay partners with Affirm, a lender that allows you to spread the price of your ring across a fixed period of time. You will have the option to apply before checking out. Read about financing in our FAQs.

*Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers affirm.com/licenses.

Platinum Cathedral Engagement Rings