Luna Round Lab Grown Diamond Solitaire Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 10

$778.00

Price updates with your selections

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 ct lab-grown diamond · IGI report · Signora Certificate included.

Understand your certificates →Certificate details →

Metal:

Center Diamond:

Choose your fit

Ring size Choose one

Forever, A & J

Live preview

Engraving 0 / 20

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.

Selected: —

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

Carat

1 ct

Customizable

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	In the Photos	Customizable
Center Diamond	Round Brilliant · 7.35–7.45 mm · Approx. 1.50 ct	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct, 4.5 ct
Accent Diamonds	None	—
Total Diamond Weight	Approx. 1.50 ct	Varies with selected center size
Stone Type	Lab Grown Diamond	—
Setting	Six-Prong Cathedral Basket Setting with Knife Edge Shank	—
Finish	High Polish	—
Occasion	Engagement · Anniversary · Bridal	—

At a glance

A round lab grown diamond solitaire engagement ring from Signora Jewels.

The ring shown features a round brilliant lab grown diamond measuring approximately 7.35–7.45 mm and weighing approximately 1.50 ct. A refined six-prong cathedral basket and knife edge shank create a timeless solitaire profile that places complete focus on the center diamond.

Made to order in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum.

Select your preferred center diamond size and precious metal using the options on this page.

The six-prong cathedral basket securely embraces the round brilliant diamond while allowing generous light to enter through the open gallery beneath. The additional prongs provide balanced protection without hiding the stone's brilliance, making this setting especially well suited to larger round diamonds.

The knife edge shank introduces crisp definition while maintaining a slim, elegant profile. Its polished surfaces reflect light beautifully and create clean architectural lines that complement the classic solitaire design. Signora Jewels handcrafts every ring to order in your selected precious metal and center diamond size.

Design Highlights

Customizable round brilliant lab grown diamond from 1 ct to 4.5 ct
Six-prong cathedral basket setting
Knife edge comfort shank
Open gallery construction
Classic solitaire styling
High polish finish

Browse our Solitaire Engagement Rings, explore the Engagement Ring Guide, or compare precious metals using our Metal Guide.

Diamond Details

Specification	Details
Center Diamond	Round Brilliant · 7.35–7.45 mm · Approx. 1.50 ct (Shown)
Accent Diamonds	None
Total Stones	1
Total Diamond Weight	Approx. 1.50 ct
Center Diamond Options	1 ct, 1.5 ct, 2 ct, 2.5 ct, 3 ct, 3.5 ct, 4 ct and 4.5 ct
Finish	High Polish

Measurements are approximate and vary according to the selected center diamond.

About Lab Grown Diamonds

The round brilliant cut is renowned for exceptional brilliance and balanced proportions. Combined with a six-prong cathedral basket and open gallery, this solitaire design allows outstanding light performance while preserving timeless elegance.

Metal, Care & Fit

Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the cathedral basket using warm water, mild soap and a soft brush to keep the diamond bright and the polished finish looking its best.

FAQ

Why does this ring use six prongs instead of four?
Six prongs provide additional support for the round brilliant diamond while maintaining excellent light exposure.

Can I choose a different center diamond size?
Yes. This design is available with center diamond sizes from 1 ct through 4.5 ct.

What is a knife edge shank?
A knife edge shank features a subtle raised center ridge that creates clean lines and gives the band a refined, contemporary profile.

Is this solitaire suitable for everyday wear?
Yes. The cathedral basket, six-prong setting and comfort-fit shank are designed to provide lasting security and comfort for everyday wear.

Your cart is empty