Cushion Old Mine Cut Lab Grown Diamond Three-Stone Ring

IGI Report IncludedMade to OrderInsured Delivery

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$558.00

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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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Center Diamond:

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Forever, A & J

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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.

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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

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 Old Mine Cut · 9.30 × 7.80 mm · approx. 3.00 ct	1–4.5 ct
Side diamonds	2 tapered baguette diamonds · approx. 0.15 ct total	Three-Stone layout
Total diamond weight	approx. 3.15 ct · 3 diamonds	Varies with selected center
Stone type	Lab Grown Diamond	—
Setting	Four-Prong Three-Stone with tapered baguette sides	—
Finish · Occasion	High Polish · Engagement, Anniversary	—

Diamond details

Shape	Size	Qty	Weight (approx.)
Cushion Old Mine Cut	9.30 × 7.80 mm	1	3.00 ct
Tapered Baguette Cut	Not specified	2	0.15 ct total
Total	—	3	3.15 ct

At a glance

A Cushion Old Mine Cut lab grown diamond three-stone engagement ring from Signora Jewels.

A 3.00 ct, 9.30 × 7.80 mm center is flanked by 2 tapered baguette diamonds totaling approx. 0.15 ct. Approx. 3.15 ct total.

Made to order in 11 metals: silver, 10K/14K/18K gold (yellow, white, rose) and platinum.

Choose your center weight and metal for this made-to-order ring.

Signora Jewels sets the 9.30 × 7.80 mm Cushion Old Mine center between two tapered baguettes, giving this three-stone ring a clean step from the broad center into the narrow shank. Four prongs leave the clipped cushion outline easy to see, while each baguette points inward toward the main diamond.

The reference basket rises approximately 7.0–7.5 mm. At the base, the band stays about 1.80 mm wide and 1.40 mm thick, so the 3.00 ct center carries the visual weight without needing pavé along the shank.

Design highlights

3.00 ct Cushion Old Mine Cut center in the reference design
Center measures approx. 9.30 × 7.80 mm
2 tapered baguette side diamonds totaling approx. 0.15 ct
Four-Prong Three-Stone setting
Tapered shoulders leading into a slim polished shank
Approx. 3.15 ct total diamond weight

The tapered baguettes work like arrows beside the cushion: wider near the center, narrower toward the band. Their straight step facets contrast with the broader flashes of the Old Mine center without adding another rounded outline.

Diamond & Ring Details

Specification	Details
Center stone	Cushion Old Mine Cut · 9.30 × 7.80 mm · approx. 3.00 ct in the photos
Side diamonds	2 tapered baguette diamonds · approx. 0.15 ct total
Total diamond weight	approx. 3.15 ct in the photographed configuration
Diamond count	3
Setting	Four-Prong Three-Stone with tapered baguette sides
Center options	1, 1.5, 2, 2.5, 3, 3.5, 4 and 4.5 ct
Finish	High Polish

Measurements are approximate; your selected center weight sets the final diamond dimensions and total weight.

About Lab Grown Diamonds

The Cushion Old Mine center uses a broader facet pattern than a modern brilliant cushion, while the tapered baguettes use long step facets. See the diamond stone guide for more on cut, proportions and shape.

Metal, Care & Fit

White gold and platinum keep the baguette settings visually close to the diamonds, while yellow and rose gold create more contrast around the three-stone arrangement. Compare choices in the metal guide. Clean beneath the center basket and along both baguette settings with warm water, mild soap and a soft brush.

FAQ

Why are tapered baguettes used beside this Cushion Old Mine center?
The two tapered baguettes narrow toward the shank and point visually toward the center. Their straight step facets also give the 3.00 ct cushion a clear contrast on both sides.

How much diamond weight is in the two side stones?
The two tapered baguettes total approximately 0.15 ct. Combined with the 3.00 ct reference center, the photographed configuration totals approximately 3.15 ct.

How is the Cushion Old Mine center held?
The center sits in a Four-Prong setting. The prongs secure the 9.30 × 7.80 mm reference diamond while leaving most of its outline and side profile visible.

Will this three-stone ring stack with a wedding band?
The raised center and tapered side-stone settings can leave a small gap beside a straight band. A contoured band follows the three-stone profile more closely.

How should the tapered baguette settings be cleaned?
Use a soft brush around the narrow ends of both baguettes and beneath the center basket. Those junctions collect more residue than the plain polished lower shank.

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