Cushion Cut Lab Grown Diamond Three-Stone Engagement Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 8

$704.00

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

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

For ChristmasOrder by Monday 30 November for delivery before 25 December. Holiday gift guide

Arrives 7 business days to make, then 5–8 insured & tracked.

30-day returns Courier, insurance & duties covered. No restocking fee.

Duties & taxesPrepaid at checkout. Nothing extra to pay on delivery.

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

Cushion Cut · Three Stone

Center

Cushion Cut

Carat

1 ct

Customizable

Metal

Customizable

Setting

Three Stone

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	Cushion Cut · 7.3 × 6.4 mm · approx. 1.50 ct	1–4.5 ct
Side diamonds	2 trillion cut diamonds · approx. 0.51 ct total	Approx. 0.51 ct at reference size
Total diamond weight	Approx. 2.01 ct · 3 stones	Varies with center selection
Stone type	Lab Grown Diamond	F color · VS1 clarity
Setting	Four-Prong center basket with prong-set trillion sides and open gallery	Center size selectable
Finish · Occasion	High Polish · Engagement, Anniversary, Bridal	11 metal options

Diamond details

Shape	Size	Qty	Weight (approx.)
Cushion Cut	7.3 × 6.4 mm	1	1.50 ct
Trillion Cut	Not specified	2	0.51 ct total
Total	—	3	2.01 ct

At a glance

A cushion cut lab grown diamond three-stone engagement ring from Signora Jewels.

One 7.3 × 6.4 mm cushion center, approx. 1.50 ct, held in a raised Four-Prong basket with two trillion cut side diamonds totaling approx. 0.51 ct. Approx. 2.01 ct combined.

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

Choose your center diamond weight and metal from the options on this page.

Look at the two triangles beside the center diamond. Their pointed ends face outward, giving the cushion cut a wider outline without adding bulk to the band. At Signora Jewels, this three-stone design pairs a 1.50 ct cushion center with two trillion cut diamonds weighing approximately 0.51 ct together. Each stone has its own prongs, so there's no metal frame running between the diamonds.

The center sits in a raised four-prong basket, with an open gallery underneath. From the front, the three diamonds form one continuous arrangement; from the side, you can see where each setting begins. The polished shank measures approximately 2.00 mm at the bottom and has no pavé, leaving the metal smooth against neighboring fingers.

Design highlights

Cushion cut center diamond, approx. 1.50 ct in the reference design
Two trillion cut side diamonds totaling approx. 0.51 ct
Three individually prong-set diamonds, approx. 2.01 ct combined
Raised Four-Prong center basket with open three-stone gallery
Plain polished shank, approx. 2.00 mm wide at the bottom
Customizable center from 1–4.5 ct, with 11 metal choices

The trillion stones do more than add carat weight. Their broad ends sit beside the cushion while their tapered tips lead into the shoulders, creating a gradual transition from the large center to the narrow gold band. There are only three diamonds in the entire ring, and each one has a defined position. Explore our three-stone rings and other engagement ring designs.

Diamond & Ring Details

Specification	Details
Center diamond	Cushion Cut · 7.3 × 6.4 mm · approx. 1.50 ct
Side diamonds	2 Trillion Cut · approx. 0.51 ct total
Combined diamond weight	Approx. 2.01 ct · 3 diamonds
Center options	1, 1.5, 2, 2.5, 3, 3.5, 4 and 4.5 ct
Center setting	Four-Prong raised basket
Side setting	Individually prong-set trillion diamonds
Gallery	Open three-stone gallery
Bottom band width	Approx. 2.00 mm
Shoulder section	Approx. 3.5–4.0 mm through side stones
Setting height	Approx. 6.3–6.8 mm
Finish	High Polish

Measurements are approximate. The selected center diamond determines the final center dimensions and combined diamond weight.

About Lab Grown Diamonds

The cushion center has softened corners and broad facets, while the trillion side stones use triangular outlines to extend the design across the finger. All three diamonds are lab grown, with F color and VS1 clarity specifications. Read our diamond and stone guide for more about cut, proportions and diamond selection.

Metal, Care & Fit

Choose from silver, 9K, 14K or 18K gold in yellow, white or rose, and platinum. The plain 2.00 mm shank is comfortable against neighboring fingers, while the raised center and pointed trillion settings need care around close-fitting sleeves. Wash with warm water, mild soap and a soft brush, paying attention to the spaces beneath the three diamonds. Remove the ring before heavy lifting or work that puts pressure on the side stones.

FAQ

Why are the side diamonds trillion cut instead of round?
The two trillion cut diamonds taper toward the shoulders, extending the cushion center visually without covering the polished band. Their broad ends sit beside the center stone, creating a balanced three-stone arrangement.

Does this ring have any pavé diamonds along the band?
No. This design contains exactly three diamonds: one cushion center and two trillion sides. The shank is plain, polished metal without pavé stones.

How high does the cushion center sit?
The reference setting measures approximately 6.3–6.8 mm high. Its raised Four-Prong basket leaves an open space beneath the center diamond, so take care around fitted gloves and delicate knitwear.

Can I change the center diamond weight?
Yes. The cushion center is available from 1 ct through 4.5 ct, including the reference 1.50 ct. The center basket is made to suit the selected diamond, while the design retains its two trillion side stones.

What should I watch for with the pointed side diamonds?
Both trillion stones have prongs securing their pointed ends. Avoid striking those tips against hard surfaces, and clean gently around the prong junctions where the side stones meet the center basket.

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