An avant-garde take on the blue engagement ring. This coffin-cut blue sapphire and black onyx ring pairs a deep-blue lab-grown sapphire, cut in a bold elongated coffin shape, with the mysterious jet-black of onyx — all set in warm 14K yellow gold vermeil. It is a ring for the unconventional bride: sophisticated, a little gothic, and impossible to mistake for anything ordinary.
Lab-grown blue sapphire
Black onyx accents
Coffin cut
Yellow gold vermeil
Avant-garde design
Free velvet gift box
A coffin cut with attitude
The coffin cut — a long hexagon with tapered sides — is one of the most distinctive silhouettes in alternative jewelry, and it suits the drama of a deep-blue sapphire perfectly. Elongated on the finger and edged with clean geometry, it reads as modern, moody and unmistakably intentional. It is a natural fit for anyone exploring gothic engagement rings and dark-romantic style. For more on what these darker designs mean and how to wear them, our guide to black rings for women is a great companion read.
The blue sapphire
At the center is a lab-grown blue sapphire — a genuine sapphire, chemically and physically identical to a mined one. That matters for a ring you intend to wear every day: sapphire is a form of corundum and sits at 9 on the Mohs scale, second only to diamond, so it is exceptionally hard and beautifully suited to daily life. Its deep blue has long symbolized loyalty, wisdom and nobility — a meaningful heart for an engagement ring.
Black onyx contrast
Accents of natural black onyx frame the sapphire, deepening the drama and giving the blue somewhere to glow against. Black onyx is a natural chalcedony, glossy and jet-dark, and it is exactly this contrast — midnight blue against true black, both warmed by gold — that gives the ring its bold, contemporary edge. Our overview of black gemstones explains why onyx remains the classic choice for high-contrast designs.
Warm 14K yellow gold vermeil
The band is finished in 14K yellow gold vermeil — a rich layer of real gold over a core of sterling silver 925. The golden tone softens the darkness of the design and lends it warmth, so a moody, gothic ring still feels inviting on the hand. Pair it with pieces from our black onyx wedding bands for a fully coordinated stack.
What the stones symbolize
Blue sapphire has stood for faithfulness and truth for centuries, while black onyx is a stone of strength, grounding and protection. Together they make a quietly powerful statement for a couple — devotion with a spine of resilience. If the combination speaks to you, explore more across our black onyx engagement rings, and our guide to black onyx meaning unpacks the symbolism in full.
Specifications
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Metal 14K yellow gold vermeil over sterling silver 925
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Center stone Lab-grown blue sapphire (genuine sapphire, Mohs 9)
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Cut Coffin (approx. 7.0 x 10.0 mm)
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Center weight Approx. 1.7 ct
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Accents Natural black onyx
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Design Avant-garde, gothic-inspired
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Personalization Optional engraving (up to 16 characters)
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Sourcing Ethically sourced, conflict-free stones
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Included Free luxury velvet gift box & lifetime warranty
Aquamarise vermeil is real gold over sterling silver 925 — the rich, golden look you love, at a price that makes it easy to say yes. Keep it luminous with a little care: remove before showering, swimming, or exercise, avoid contact with lotions and fragrance, and store dry between wears. Want gold all the way through? The same design is also available in solid gold.
Sizing & care
Choose your size at checkout. If you are between sizes or unsure, we are happy to help — and if the fit is not quite right, resizing is available and starts from a modest fee. To keep the sapphire, onyx and golden band looking their best, remove the ring before showering, swimming or applying lotions, and store it dry between wears. A soft, dry cloth brings back the shine beautifully.
Frequently asked questions
Is the blue sapphire real?
Yes. It is a lab-grown blue sapphire, which is a genuine sapphire — chemically and physically identical to a mined one, just created in a controlled setting. It is a real, durable gemstone.
How durable is the sapphire?
Very. Sapphire is a form of corundum and sits at 9 on the Mohs scale, second only to diamond. That makes it one of the toughest gemstones you can choose for an everyday engagement ring.
Is the black onyx natural?
Yes. The accents are natural black onyx, a genuine chalcedony polished to a deep, glossy jet-black that frames the blue sapphire with dramatic contrast.
What is yellow gold vermeil?
Yellow gold vermeil is real gold layered over sterling silver 925 — the warm, golden look of gold at a much easier price. If you would prefer gold all the way through, the same design is also available in solid gold.
What is a coffin cut?
A coffin cut is an elongated hexagon with tapered sides — a bold, geometric shape popular in alternative and gothic jewelry. Here it measures roughly 7.0 x 10.0 mm.
Does this come as a set?
This listing is for the single engagement ring. You can pair it with a coordinating band from our black onyx wedding bands collection for a complete stack.
Can I wear this as an engagement ring?
Absolutely. It is designed as a non-traditional engagement ring, and thanks to the sapphire's hardness it is well suited to everyday wear. It also makes a striking promise or anniversary ring.
Can it be engraved?
Yes. You can add a personal engraving of up to 16 characters at checkout — a date, initials or a short message. Engraved pieces are final sale, so please double-check spelling.
How do I care for it?
Remove the ring before showering, swimming or exercise, avoid contact with lotions and fragrance, and store it dry between wears. A soft dry cloth restores the shine.
What size should I order?
Select your ring size at checkout. If you are unsure or between sizes, contact us for guidance. Resizing is available and starts from a modest fee.
Are the stones ethically sourced?
Yes. All of our stones are ethically sourced and conflict-free, so you can wear your ring with complete peace of mind.
Does it arrive gift-ready?
Every order ships in a free luxury velvet gift box and is backed by our lifetime warranty — ready for a proposal or to give as a keepsake.
Can I see other black onyx designs?
Of course. Explore the full black onyx engagement rings collection to find more dark-romantic styles.
