Cushion Lab Grown Diamond Three Stone Engagement Ring (1.00 ct, Trillion Sides)

IGI Report IncludedMade to OrderInsured Delivery

cushion lab grown diamond three stone ring in yellow gold

1 of 12

$705.00

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

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Metal:

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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

Cushion Cut · Three Stone

Center

Cushion Cut

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	Details
Ring style	Three Stone
Center diamond	Cushion · 6.90 × 5.90 mm · approx. 1.00 ct
Side diamonds	2 Curved Trillion · 3.75 × 3.75 mm · approx. 0.30 ct total
Total diamond weight	Approx. 1.30 ct (3 diamonds)
Stone type	Lab Grown Diamond
Setting	Prong Setting
Finish	High Polish
Occasion	Engagement, Anniversary

Made to order — select your options above. Want something custom?

Customize your jewelry here.

A cushion lab grown diamond sits between two curved trillion side stones, creating a balanced three-stone design that draws the eye across the finger instead of focusing only on the center. Signora Jewels makes each ring to order, so every piece is crafted specifically for your chosen metal.

The 6.90 × 5.90 mm cushion center is held in an open prong setting that lets light enter from every direction. Curved trillion diamonds taper neatly into the shoulders, giving the ring a clean transition from the center stone to the band without adding unnecessary bulk.

Design highlights

1.00 ct cushion lab grown diamond center
Two curved trillion lab grown side diamonds
Approx. 1.30 ct total diamond weight
Classic three-stone engagement ring design
Open prong setting for maximum light return
Available in 11 metal options

The curved trillion side diamonds soften the outline of the center while keeping the ring bright from edge to edge. From the top, the three stones read as one continuous composition with crisp, balanced proportions.

About Lab Grown Diamonds

A cushion cut combines softly rounded corners with brilliant faceting, producing broad flashes of light and lively sparkle. Its balanced outline makes it one of the most popular choices for three-stone engagement rings.

Every lab grown diamond from Signora Jewels is chemically, physically and optically identical to a mined diamond. Each is graded using the same 4C standards and offers a documented origin without mining.

Metal, Care & Fit

Available in Sterling Silver, 9K, 14K and 18K yellow, white and rose gold, plus platinum. Order your regular ring size. Clean with warm water, mild soap and a soft brush, then dry with a soft lint-free cloth. Store separately to help maintain the high-polish finish.

FAQ

Is the center diamond included?
Yes. The ring includes the 1.00 ct cushion lab grown center diamond together with two curved trillion side diamonds exactly as shown.

What is the total diamond weight?
The ring contains approximately 1.30 carats of lab grown diamonds across three stones.

Are lab grown diamonds real diamonds?
Yes. Lab grown diamonds have the same chemical composition, hardness and brilliance as mined diamonds and are graded using the same standards.

Why choose a three-stone ring?
Three-stone designs create a wider look across the finger while giving the center diamond additional visual presence through the side stones.

Can the ring be resized?
Most precious metal versions can be resized after purchase. Contact Signora Jewels if you need assistance.

How is the ring shipped?
Every order is securely packaged, fully insured and shipped with tracking.

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