An heirloom from an older, darker romance. This Celtic black onyx engagement ring set centers a pear-cut natural black onyx — deep, glossy and jet-black — in a knotwork setting that carries more than a thousand years of Celtic tradition. Cast in solid 925 sterling silver with a bright rhodium finish and lit by simulated diamond accents, the engagement ring and matching band were made to be worn together as one complete, storied whole.
Natural black onyx
Pear cut · 6 x 8 mm
Celtic knotwork
Solid 925 sterling silver
Rhodium finish
Matching ring set
Celtic knots, cast around midnight
Interlacing Celtic knotwork winds down the shoulders of the band — lines that loop endlessly with no beginning and no end, the old symbol of eternal connection. At the heart sits a pear-cut black onyx, its tapered point drawing the eye like a single dark flame. It is a design that trades the conventional white solitaire for something with heritage and shadow, at home among our gothic couple rings and made for those who want their vows to carry a little myth. For the history behind this look, our feature on Victorian gothic engagement rings traces the dark-romantic tradition it belongs to.
The engagement ring
Holds the pear-cut black onyx center in a Celtic knotwork setting lit with simulated diamond accents — the focal point of the pair.
The matching band
A slender knotwork band that nests alongside the engagement ring to complete the set, and pairs beautifully with our black onyx wedding bands.
The natural black onyx
The centerpiece is a magnificent natural black onyx, expertly cut into a pear shape of roughly 1.5 carats. Onyx is a variety of chalcedony — a fine-grained quartz that has been carved into seals, cameos and talismans since antiquity — and it is prized for its rich, even black hue and captivating glassy sheen. At around 7 on the Mohs scale it is a firm, daily-wearable stone, and the pear cut adds a touch of vintage drama that echoes the ring's Celtic character. To read more about the family of dark gems it belongs to, see our guide to black gemstones.
A crisp simulated diamond sparkle
Simulated diamond accents (cubic zirconia) frame the onyx and catch the light in bright, precise points, throwing the deep black of the center into beautiful relief. It is a classic, budget-friendly way to add engagement-ring shimmer while keeping the onyx the undisputed star.
Sterling silver with a rhodium finish
Both rings are crafted in solid 925 sterling silver and finished with rhodium — the same precious white metal used on fine white-gold jewelry. Rhodium gives the silver a mirror-bright luster and a protective layer that helps resist tarnish and everyday scratches, so the set keeps looking freshly polished. Its cool tone is the ideal foil for jet-black onyx.
What black onyx symbolizes
For centuries black onyx has been worn as a stone of strength, protection and steady resolve, believed to absorb heavy energy and ground the wearer through change. Set within eternal Celtic knots, it becomes a fitting emblem of a bond meant to hold firm and endure. Our guide to black onyx meaning explores that symbolism, and you can find companion pieces among our black onyx couples rings.
Specifications
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Metal Solid 925 sterling silver with rhodium finish
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Center stone Natural black onyx, pear cut
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Gem size 6.0 x 8.0 mm, approx. 1.5 ct
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Accents Simulated diamond (cubic zirconia)
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Design Celtic knotwork
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Set includes Engagement ring + matching band
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Band width Approx. 1.6 mm each ring
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Hardness Onyx 7 (Mohs scale)
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Sourcing Ethically sourced, conflict-free stones
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Included Free luxury velvet gift box & lifetime warranty
Sizing & care
Choose your size at checkout. If you are between sizes or unsure, message us before ordering and we will help you land on the right fit — resizing is available starting from a modest fee. To keep the onyx and rhodium finish at their brightest, remove the rings before showering, swimming or applying lotions, and store them in the velvet box when not worn. A soft, dry cloth brings the shine right back.
Frequently asked questions
Is the black onyx natural?
Yes. The centerpiece is a natural black onyx, a chalcedony quartz with a deep, glossy jet-black body, expertly cut into a pear shape and polished to a mirror finish.
Does this come as a set?
Yes. It includes the black onyx engagement ring plus a matching Celtic knotwork band designed to nest alongside it, creating one complete look.
How large is the center stone?
The pear-cut black onyx measures approximately 6.0 x 8.0 mm, around 1.5 carats, giving it real presence on the hand while staying elegant and wearable.
What are the sparkling accents?
They are simulated diamonds (cubic zirconia) framing the onyx. They add a crisp flash of white sparkle that makes the black center look even deeper, at a friendly price.
Why a pear cut?
The pear shape has a rounded base and a single tapered point, lending the ring vintage drama and elongating the finger. It suits the Celtic knotwork setting and gives the black onyx a flame-like silhouette.
What metal is it made from?
Both rings are solid 925 sterling silver, finished with rhodium for a bright white luster and extra protection against tarnish and scratches.
What does the rhodium finish do?
Rhodium is the same precious metal used to finish fine white gold. It gives the silver a mirror-bright shine and adds a protective layer that helps the rings stay looking freshly polished.
Is black onyx durable enough for daily wear?
Black onyx sits around 7 on the Mohs scale, well suited to everyday wear with normal care. Avoid hard knocks and remove the rings for rough activities to protect the polish.
What does the Celtic knotwork mean?
Celtic knots interlace in continuous loops with no beginning or end, a traditional symbol of eternal connection. Around a black onyx of strength and protection, it reads as a bond meant to hold firm and endure.
How do I care for the rings?
Remove them before showering, swimming or applying lotions, store them in the velvet box, and buff with a soft dry cloth to restore 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. Our stones are ethically sourced and conflict-free, so you can wear the set 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.
