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Round Lab Grown Diamond Portuguese Engagement Ring
1 of 9
The Signora Promise
Hand-finished in SuratMade to order
IGI Report IncludedExact 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
CustomizableMetal
CustomizableSetting
Solitaire
An independent IGI grading report is included when the selected individual lab-grown center diamond is 1.00 ct or larger. Its report number is laser-inscribed on that report-bearing center diamond. Accent and side diamonds are matched and inspected to Signora Standards and are not individually laboratory graded.
| Detail | In the photos | Customizable |
|---|---|---|
| Center diamond | Portuguese Cut Round Brilliant · 8.75 mm · approx. 3.00 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. 3.00 ct | Varies with center size |
| Stone type | Lab Grown Diamond | — |
| Setting | Six-Prong Cathedral Open Lotus Basket with Pinched Shank | — |
| Finish · Occasion | High Polish · Engagement, Anniversary, Bridal | — |
At a glance
A Portuguese cut round lab grown diamond engagement ring from Signora Jewels.
An approximately 3.00 ct Portuguese cut round brilliant measuring 8.75 mm is secured in a six-prong open lotus basket above a pinched comfort-fit shank.
Made to order in 11 metals: Silver, 9K/14K/18K Gold (Yellow, White and Rose) and Platinum.
Each metal color is shown in the photos. Choose your preferred center diamond weight and metal from the options on this page.
The Portuguese cut is known for its intricate facet arrangement, producing layers of reflections that continue deep into the center of the diamond. At Signora Jewels, six evenly spaced prongs hold the stone within an open lotus basket that allows light to reach the pavilion from every direction while preserving the round outline.
The pinched shoulders narrow gently beneath the basket before flowing into a 2.10 mm comfort-fit shank, giving the larger center diamond a balanced appearance. With an approximate setting height of 8.20 mm, the elevated basket creates an airy side profile while maintaining a secure six-prong structure.
Browse our engagement rings, compare diamond shapes in the diamond stone guide, or explore precious metal options in our metal guide.
Design highlights
- Portuguese cut round center shown at approximately 3.00 ct
- Customizable center diamond from 1 ct to 4.5 ct
- Six-prong open lotus basket setting
- Pinched comfort-fit shank
- Open gallery beneath the center stone
- Made to order in 11 precious metal options
The lotus basket remains visible beneath the diamond rather than disappearing behind it, adding detail from the side while leaving the round silhouette clean from above. The pinched shoulders naturally draw the eye toward the center without the need for accent stones.
Diamond & Ring Details
| Specification | Details |
|---|---|
| Center stone | Portuguese Cut Round Brilliant · 8.75 mm · approx. 3.00 ct (shown) |
| Accent stones | None |
| Total weight / count | Approx. 3.00 ct · 1 Diamond |
| Setting | Six-Prong Cathedral Open Lotus Basket with Pinched Shank |
| Center 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. Your selected center diamond weight determines the final proportions of the finished ring.
About Lab Grown Diamonds
The Portuguese cut features a greater number of facets than a standard round brilliant, creating layered reflections and exceptional visual depth. Every center diamond is F color, VS1 clarity and , selected to complement the proportions of this cathedral solitaire.
Metal, Care & Fit
Available in Silver, 9K, 14K and 18K Yellow, White and Rose Gold, plus Platinum. Clean beneath the open lotus basket using warm water, mild soap and a soft brush to remove everyday buildup. Check the six prongs periodically to ensure the larger center diamond remains securely held.
FAQ
What makes a Portuguese cut different from a standard round brilliant?
The Portuguese cut has many additional facets that create layered reflections throughout the diamond. This produces greater visual depth while maintaining a classic round outline.
Why does this ring use a lotus basket?
The lotus basket supports the diamond with six evenly spaced prongs while allowing light to enter from beneath through the open gallery. It also creates an elegant floral profile from the side.
Will the 3.00 ct center feel too high?
The approximately 8.20 mm setting height keeps the diamond elevated for maximum light return, while the cathedral shoulders and six-prong basket provide balanced support for everyday wear.
Which metal color best complements this design?
White gold and platinum maximize the crisp appearance of the Portuguese cut, while yellow and rose gold provide warm contrast around the brilliant center diamond.
Common questions
Ring questions, answered
Timing, shipping, certification and return eligibility for made-to-order rings.
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Answers last updated July 31, 2026
When will my order ship?
Standard listed pieces are made to order with an estimated dispatch of 7 business days. Use the product-page estimate when it is more specific and the timing confirmed after ordering. Delivery timing begins after dispatch and varies by destination and carrier service. Fully custom commissions follow the production schedule confirmed with their approved specifications or CAD.
When is express shipping free?
The configured free-shipping reference is orders over $500 USD. Eligibility, any currency equivalent, the available service and the final shipping charge are determined by the cart and Shopify checkout for your destination and order total before payment.
Will I have to pay import duties?
Duties and applicable import taxes are prepaid by Signora for deliveries to the US, UK and Canada. You should not be asked to pay them again on delivery.
What certificate comes with my jewelry?
Every finished Signora jewelry product includes a Signora Jewelry Certificate. Any independent stone report included with the selected configuration is shown in the product details and order record.
Can I return a made-to-order listed design?
Standard listed products are eligible for return within 30 days of delivery when unworn, unused and in their original condition, with the original packaging and included documents. Normal listed choices such as metal, stone carat, chain or bracelet length, an extended ring size, or complimentary engraving do not by themselves make an item Final Sale. A sale or discount also does not imply Final Sale; only an item explicitly classified as Final Sale follows the non-returnable exclusion.
How are fully custom orders handled?
A fully custom commission is different from a listed made-to-order design. After its specifications or CAD are approved, a normal change-of-mind return does not apply. Manufacturing defects are still handled, and Signora will review any exceptional circumstances with the customer.