Certified Lab-Grown Marquise Diamonds
Frequently Asked Questions (FAQs)
Bow-tie is not graded on certificates, so visual evaluation is required when sourcing marquise cuts. Request face-up imagery under diffuse lighting and check for a dark central band; severely visible bow-tie should be avoided for retail. LabGems prioritises minimal bow-tie across its IGI-certified marquise inventory in Antwerp, searchable through the certified diamond search platform.
1.85 to 2.00 is the most balanced commercial range for marquise cuts. Ratios closer to 1.75 read shorter and more rounded, while ratios approaching 2.25 emphasise extreme elongation. LabGems holds IGI-certified marquise cuts from approximately 0.30ct through 3.00ct, with the broader-demand oval cut available alongside for elongated inventory.
Oval cuts hold the broadest contemporary engagement acceptance, pear cuts perform strongly in pendant applications, and marquise performs best in vintage-led positioning. LabGems stocks all three as IGI-certified options, including the high-demand pear cut, so trade buyers can balance shape inventory against retail strategy.
LabGems supplies marquise cuts both IGI-certified and non-certified. Non-certified wholesale marquise stock prices roughly 20% lower than certified equivalents, suiting volume work. The non-certified marquise range complements the IGI-certified marquise inventory held in Antwerp, with a €500 minimum across all purchases.
Marquise cuts dispatch from Antwerp within 1 business day once in stock; custom marquise specifications ship within 7-10 business days. FedEx delivery across Europe runs 1 to 3 days, for a typical total of 2 to 4 days. All certified marquise stock ships with IGI documentation confirming lab-grown origin, at LabGems.
Marquise cut lab-grown diamonds deliver the largest visual footprint per carat of any shape in the certified inventory. Characterised by an elongated boat-like silhouette with pointed ends, the marquise creates a dramatic finger-lengthening effect that makes stones appear noticeably larger face-up than round or square cuts of identical weight. For trade buyers, marquise inventory serves clients seeking maximum visual presence per carat, vintage-inspired aesthetics, or distinctive east-west mounting options. LabGems holds IGI-certified marquise cuts in active Antwerp inventory for direct trade allocation.
Sourcing and Specifications
Active Antwerp inventory typically includes marquise cuts from approximately 0.30ct through 3.00ct across traditional and elongated ratios. All certified stock is supplied with IGI documentation detailing complete 4Cs grading, proportions, and lab-grown origin verification. Standard sizes ship within 1 business day; custom marquise specifications outside active inventory ship within 7 business days. A €500 minimum applies across all certified diamond purchases. Browse live inventory through the certified diamond search platform.
Evaluating Proportions and Symmetry
Length-to-width (L:W) ratio defines the marquise silhouette. The classic commercial range sits between 1.85 and 2.00, achieving a balanced proportion that is neither overly squat nor excessively narrow. Ratios below 1.75 produce a broader outline closer to an oval, while ratios above 2.10 create a slim, dramatic shape preferred for east-west ring settings and drop earrings. Symmetry is exceptionally critical — the two pointed tips must align precisely with the central axis, and side lobes must be mirror-matched. Trade buyers should insist on Very Good or Excellent symmetry grades. For alternative elongated brilliant-cut options, explore the oval cut or pear cut collections.
Bow-Tie Control and Tip Protection
Like ovals and pears, marquise cuts can exhibit a central bow-tie effect — a dark shadow cast across the belly facets due to light leakage. Visual inspection is essential, as bow-tie intensity is not recorded on grading certificates. LabGems pre-screens marquise inventory to ensure minimal bow-tie appearance. Additionally, the pointed tips represent vulnerable stress points prone to chipping during setting. Jewellers should specify V-tip prongs or bezel caps at both ends to safeguard the stone. For uncertified alternatives, review the non-certified fancy shape collection.
Selection Notes for Marquise Cuts
- Target 1.85–2.00 L:W ratio for classic balanced proportions
- Require Very Good or Excellent symmetry to guarantee tip alignment and lobe matching
- Select pre-screened stones to avoid pronounced central bow-tie shadows
- Recommend V-prong or bezel tip protection on client mounting specifications
- Combine with other fancy shapes to meet the €500 minimum purchase threshold