Dutch Marquise Lab Grown Diamond Engagement Rings

Every finished piece includes a Signora Jewelry Certificate. Each approved individual lab-grown center or primary diamond of 0.50 ct or more also includes an IGI grading report. Other independent documentation and its scope are stated on the product page or approved specification. Our IGI diamond certification guide explains how to read the report.

About 12–15 business days (7 to make + 5–8 shipping). Fully custom commissions follow the production schedule confirmed with their approved specifications or CAD. For every destination available at checkout, Signora prepays applicable import duties and import taxes. Customers should not be asked to pay those import charges again on delivery.

Yes. Many designs can be ordered in 10K, 14K, or 18K gold or platinum Pt950, and our Truly Custom service can build a ring from the ground up. 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 remain reviewable. Signora may accept an exceptional non-defect return case by case; documented labor and genuinely non-recoverable costs may be deducted, but these deductions are not a restocking fee.

Borrow a ring worn on the same finger and match it against a sizing chart, or trace its inner circle — the ring size and fit guide shows both methods. Contact us before ordering if the size is uncertain and before arranging any later resizing; third-party alteration may affect return eligibility and warranty assessment.

Standard listed products are eligible for return within 30 days after carrier-recorded 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. 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 remain reviewable. Signora may accept an exceptional non-defect return case by case; documented labor and genuinely non-recoverable costs may be deducted, but these deductions are not a restocking fee. Contact Signora for authorization before sending an item. For an eligible authorized standard return, Signora provides a prepaid, insured return label and covers the return courier cost, return transit insurance, and applicable return customs, import duties and import taxes. No restocking fee applies.