Round Lab Grown Diamond Six-Prong Cathedral Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

round diamond six-prong cathedral ring in yellow gold

1 of 12

$663.00

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Independently graded by IGI IGI Report Included Selected 0.50 ct+ lab-grown center or primary diamond · IGI grading report · Signora Jewelry Certificate included. 1.17 ct lab-grown diamond · IGI report · Signora Certificate included.

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Complimentary · hand-engraved to order · adds about 3–4 days.

Estimated dispatch: 7 business days Duties & taxes prepaid

Ring size guide

Lay a ring you own flat on the circle and slide until it sits just inside it — or set its inner diameter directly.

Measure the inside of a ring that already fits — inner edge to edge — with a ruler in mm, then set it below. No ring handy? Try Measure your finger.

14 mm 24 mm 17.3 mm

Inner diameter mm

US size

UK size

EU size

Circumference

54.3 mm

Between sizes? Always choose the larger size. Fingers are slightly bigger in the evening — measure then for the best fit.

Method 1 — Use an existing ring

Find a ring that fits the intended finger comfortably.
Place it flat and measure the inner diameter (inside edge to inside edge) in mm.
Enter that measurement in the Measure a ring tab.

Method 2 — Wrap and measure

Wrap a thin strip of paper around the base of your finger.
Mark where it overlaps — measure that length in mm (your circumference).
Divide by 3.1416 (π) to get your diameter, then use the Measure a ring tab.

Tip: Middle finger sizes typically run half a size larger than the ring finger. If between sizes, go up. Measure in the evening — fingers are slightly larger then.

7US size

US	UK	EU	Diameter	Circumference

Highlighted row = your converted size. Most common women's sizes are US 6–7. All measurements in mm.

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The Signora Promise

Hand-finished in SuratMade to order

Reports where statedExact scope shown

Insured deliverySigned & tracked

Secure checkoutShopify checkout

Standard-design returns30-day eligibility

Final inspectionChecked before dispatch

About This Ring

Round Brilliant · Solitaire

Center

Round Brilliant

Metal

Customizable

Setting

Solitaire

An independent IGI grading report is included when the selected individual lab-grown center or primary diamond is 0.50 ct or larger.

Detail	Details
Ring style	Cathedral solitaire engagement ring
Center diamond	Round · approx. 6.80 mm · approx. 1.17 ct
Total diamond weight	Approx. 1.17 ct · 1 diamond
Stone type	Lab Grown Diamond
Setting	Six-prong open basket with cathedral shoulders
Profile	Approx. 6.80 mm high
Band	High-polish shank · approx. 1.48 mm at base
Finish	High Polish
Occasion	Engagement

At a glance

A round Lab Grown Diamond six-prong cathedral engagement ring from Signora Jewels.

One IGI-certified round diamond measures approx. 6.80 mm, weighs approx. 1.17 ct and sits in an open six-prong basket.

Made to order in 11 metals: silver, 9K/14K/18K gold in yellow, white or rose, and platinum.

Made to order — select your metal above. Need another center size or a lower profile? Customize your jewelry here.

This round Lab Grown Diamond engagement ring from Signora Jewels lifts a 6.80 mm center between six evenly spaced prongs. The shoulders rise into the basket from both sides, supporting the head without adding diamonds or extra metal around the stone.

From above, the setting nearly disappears behind the round outline. Turn the ring sideways and the cathedral arches become clear, leaving an open space beneath the diamond for light and cleaning. The head stands about 6.80 mm above the finger, while the narrow 1.48 mm base keeps the shank light in the hand. Learn how round diamonds are cut in the diamond and stone guide.

Design highlights

Approx. 1.17 ct round center diamond
Approx. 6.80 mm center diameter
Six-prong open basket setting
Raised cathedral shoulders support the head
Approx. 6.80 mm setting height
Approx. 1.48 mm high-polish shank at the base
No halo, pavé or side stones
Made to order in 11 metal and color combinations

The six-prong spacing is the detail to notice. It breaks the metal into small, even points around the diamond, so the round edge remains visible instead of reading as a heavy crown.

About Lab Grown Diamonds

A round brilliant is cut with 57–58 facets arranged to return light toward the eye. Its circular outline keeps the sparkle even as the hand turns and hides small inclusions better than step-cut shapes.

Every diamond in this ring is lab grown, with the same carbon crystal structure, hardness and optical properties as a mined diamond. It is assessed using the same cut, color, clarity and carat standards.

Metal, Care & Fit

Sterling silver is bright and accessible. 9K, 14K and 18K gold increase in gold content and color richness, while platinum is naturally white and dense. Gold is available in yellow, white and rose.

Order in your known size or use the ring size and fit guide. Clean beneath the open basket with warm water, mild soap and a soft brush. Have all six prongs checked during routine professional inspections.

FAQ

Is the 1.17 ct center diamond included?
Yes, the price includes the approx. 1.17 ct round Lab Grown Diamond shown in the design. This is a fixed solitaire ring with no separate carat-selection option.

How large is the round diamond?
The center measures approximately 6.80 mm across and weighs about 1.17 ct. Its circular outline gives an even face-up spread from every viewing angle.

How high does the ring sit?
The setting rises approximately 6.80 mm from the finger. The open cathedral profile leaves space beneath the diamond for light and access during cleaning.

What does a cathedral setting do?
A cathedral setting raises the shoulders of the band so they meet and support the center basket. On this ring, the arches are visible from the side while the top view remains a plain solitaire.

Is a six-prong setting more secure than a four-prong setting?
A six-prong setting places two more contact points around the diamond than a four-prong setting. It covers slightly more of the edge but distributes support more evenly around the round center.

What is the difference between 9K and 18K gold?
9K gold contains less pure gold and is harder for frequent wear, while 18K has richer color and higher gold content. Both are solid gold and come in yellow, white and rose.

Can the center size or setting be changed?
Yes, Signora Jewels can adjust the diamond size, basket height, prong count or metal through the bespoke service. The listed version remains fixed at approximately 1.17 ct.

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