• Face-up view of a cornflower-blue lab-grown sapphire between tweezers, showing its elongated hexagonal shape.
  • Video showing a 12 × 7 mm cornflower-blue lab-grown sapphire with a Dutch marquise shape between tweezers
  • Angled view of a cornflower-blue lab-grown sapphire on a pale surface, showing bright central facets and blue edges.
  • Angled close-up of a cornflower-blue lab-grown sapphire against fingers, showing dark blue and bright step facets.
  • Cornflower-blue lab-grown sapphire held vertically between tweezers against a fingertip for scale.
  • Horizontal face-up view of a cornflower-blue lab-grown sapphire on a pale surface, showing its step-facet pattern.
  • Angled cornflower-blue lab-grown sapphire on a pale background, with bright white and blue facet reflections.
  • Three-quarter view of a cornflower-blue lab-grown sapphire on a pale surface, showing its raised profile and facets.
  • Cornflower-blue lab-grown sapphire against fingers, with pale central reflections and blue edge facets.
  • Cornflower-blue lab-grown sapphire held upright between tweezers, with light and dark blue facet reflections.
  • Cornflower-blue lab-grown sapphire between tweezers, showing a pale central area and blue reflections near the pointed ends.
  • Cornflower-blue lab-grown sapphire resting horizontally against fingers, showing its elongated hexagonal outline.
  • Tilted cornflower-blue lab-grown sapphire against fingers, with bright central facets and blue ends.
  • Information card about Czochralski-pulled laboratory-grown gemstones.
  • Side profile of a cornflower-blue lab-grown sapphire on a pale surface, showing its faceted outline.
  • Cornflower-blue lab-grown sapphire between tweezers, showing a broad pale centre framed by blue edge facets.
  • Cornflower-blue lab-grown sapphire between tweezers against a fingertip, showing a broad pale central area.
  • Low angled view of a cornflower-blue lab-grown sapphire on a pale surface, showing its profile and broad pale facets.
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12x7mm Cornflower-Blue Lab-Grown Sapphire — Dutch Marquise Hexagon

12x7mm Cornflower-Blue Lab-Grown Sapphire — Dutch Marquise Hexagon

$484.00 USD
$484.00 USD
Sale Sold out
Taxes included. Standard shipping · Estimated delivery in about 2 weeks after dispatch.

CFB-DMQ-12x7

Low stock: 3 left

Import duties covered.

Standard: about 2 weeks after dispatch. Express: estimated 3–7 days after dispatch. Processing time is separate.

Returns: notify us within 14 days of receipt. Policy conditions and custom-order exclusions apply.

Shipping and returns details Refund policy

Faceted and finished by a master cutter in our own Bangkok cutting facility, this approximately 12x7mm cornflower-blue Czochralski-pulled lab-grown sapphire combines a Dutch marquise elongated-hexagon outline with step-cut facets. Offered as one loose stone.

The stone you receive

This is a repeat-production listing, not a one-of-a-kind stone. Photos and video show representative CFB-DMQ-12x7 production. Your sapphire will use the same lab-grown material, shape and cutting style, but may not be the exact stone pictured.

The standard face-up size is approximately 12x7mm, with a normal production tolerance of ±0.2 mm for length and width. Small differences in colour tone, weight and reflections are normal between individually faceted stones. This design is offered by approximate face-up size; carat weight varies between stones. If precise fit or colour matching matters, contact us before ordering to confirm measurements, colour and availability.

Stone details

  • Material: Lab-grown sapphire (synthetic corundum), not natural or mined
  • Growth method: Czochralski pulled
  • Colour: Cornflower blue
  • Shape: Dutch marquise / elongated hexagon
  • Cut: Step cut
  • Face-up size: Approximately 12x7mm; tolerance ±0.2 mm for length and width
  • Approximate weight: Approximately 3 carats; varies by stone
  • Approximate depth: Approximately 4.5 mm; varies by stone
  • Clarity: Loupe clean
  • Post-growth treatment: None
  • Independent laboratory report: Not included
  • Faceting: Our own cutting facility in Bangkok, Thailand
  • Quantity supplied: One loose stone
  • SKU: CFB-DMQ-12x7

About the growth method

We precision-cut this sapphire from selected Czochralski-pulled material suitable for this design. This controlled, seed-grown process draws a crystal from a melt. This material is suitable for precise fancy cuts. “Pulled” describes the growth method; it does not mean natural or mined.

Learn how the Czochralski pulling method works.

Every finished stone passes our internal quality-control inspection before dispatch. This in-house QC is not independent laboratory certification.

Laboratory report

No independent laboratory report is included. All stated specifications, including clarity, are based on our examination of each supplied stone. For current-stone photographs or availability for a particular date, please contact us.

Photos, setting and custom cutting

Our gemstone photos and video were captured in natural daylight. Lighting, viewing angle and screen settings can affect the colour and reflections you see. Your jeweler should confirm the final fit against the supplied stone and protect both pointed ends during setting.

For another size or shape, matched pairs or repeat-production quantities, contact Brahma Diam to discuss your project.

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