A love that breaks from tradition. The Hexagon Coffin Tanzanite engagement ring set centers a coffin-cut tanzanite in deep, regal purple, lifted above a smoky blackened band so the color seems to glow out of the shadow. Crafted in solid 925 sterling silver and finished in deep black ruthenium, this two-piece bridal set is avant-garde, gothic and unforgettable — made for lovers of the dark.
Coffin-cut tanzanite
Solid 925 sterling silver
Black ruthenium finish
Two-piece bridal set
Deep purple center
Free velvet gift box
A gothic, avant-garde proposal
The elongated hexagon coffin cut is one of the boldest silhouettes in alternative bridal — angular, architectural and unmistakably gothic. Raised above a blackened band, the purple tanzanite reads like a jewel set into wrought iron, an aesthetic made for individuality over convention. It sits right at home among our gothic engagement rings and coffin-cut engagement rings, and the color story carries through our wider tanzanite engagement rings collection.
The engagement ring
Holds the 7 x 11 mm hexagon coffin-cut tanzanite (approx. 1.7 ct) in a setting flanked by simulated diamonds — the statement piece and focal point of the set.
The matching band
A slender blackened band designed to nest cleanly against the engagement ring, completing the two-piece bridal silhouette. Lovely stacked or worn alone.
The tanzanite center
At the heart of the set is a striking simulated tanzanite in a deep, velvety purple — the noble violet-blue that made tanzanite one of the most coveted colored gems of the last century. Simulated tanzanite gives you that rich, saturated hue with crisp, consistent color and brilliant sparkle, chosen to look its most dramatic framed by dark metal. December babies will love it as a birthstone; everyone else will simply love the color. To learn the lore behind the stone, our guide to tanzanite meaning is a beautiful place to start.
Simulated-diamond accents
Sparkling simulated diamonds (crisp cubic zirconia) frame the setting, adding bright white fire that makes the purple read even deeper. It is a brilliant, budget-friendly way to layer in classic engagement-ring shimmer, and the contrast of white sparkle against blackened silver is what gives this set its avant-garde edge. Prefer a lab-grown diamond or moissanite accent instead? Message us — most of our designs can be upgraded.
The black ruthenium finish
The set is finished in black ruthenium, a rare precious metal from the platinum family, applied over solid 925 sterling silver. Ruthenium reads as a deep, smoky gunmetal — a rich blackened-silver tone rather than a flat, pure jet-black. That is the beauty of it: instead of looking painted-on, the finish carries genuine depth and an antique, gothic-vintage warmth, so every angular facet of the coffin cut holds a soft shadow. It is a more precious, more durable finish than ordinary black plating or oxidized silver, and it lets a sterling silver ring wear like something far darker and more mysterious. Curious about the metal? Read what is black ruthenium.
What it symbolizes
Purple has always been the color of royalty, wisdom and nobility, while black speaks to mystery, strength and devotion that endures. Together they make this coffin-cut set a fitting emblem for a love that is both powerful and unconventional. For more on the meaning behind dark rings, see our guide to black rings for women and our edit of gothic wedding rings for dark romance.
Specifications
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Metal Solid 925 sterling silver with black ruthenium finish
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Center stone Simulated tanzanite, hexagon coffin cut (7 x 11 mm, approx. 1.7 ct)
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Color Deep purple
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Accents Simulated diamonds (cubic zirconia)
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Set includes Engagement ring + matching band
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Finish Black ruthenium (smoky gunmetal)
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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
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 tanzanite and the black ruthenium finish at their richest, remove the rings before showering, swimming or applying lotions and fragrance, and store them in the velvet box between wears. A soft, dry cloth restores the shine beautifully. With gentle care, this is a set made to be worn every day.
Frequently asked questions
Is the tanzanite real?
The center is a simulated tanzanite, chosen for its deep, saturated purple and brilliant sparkle. It gives you that coveted violet-blue color at an easy price, framed to look its most dramatic against the dark metal.
Is it pure black?
Not pure jet-black — and that is by design. Black ruthenium is a deep, smoky gunmetal, a rich blackened-silver tone. It carries real depth and an antique, gothic-vintage warmth that flat, painted jet-black finishes cannot, so the ring reads as dark and mysterious rather than one-dimensional.
What is black ruthenium?
Ruthenium is a rare precious metal from the platinum family. Applied over sterling silver, it creates a deep blackened-silver finish that is more precious and more durable than ordinary black plating or oxidized silver.
What is a coffin cut?
An elongated, angular hexagon shape with a bold, architectural outline. It is one of the most striking silhouettes in gothic and alternative bridal — dramatic on the finger and unmistakably individual.
What metal is it made from?
Solid 925 sterling silver, finished in black ruthenium for its smoky gunmetal depth. It is real sterling silver, not a base-metal alloy or a hollow “filled” piece.
Does this come as a set?
Yes — it is a complete two-piece bridal set: the coffin-cut tanzanite engagement ring plus a matching blackened band designed to nest alongside it. The band can also be worn on its own.
What are the accent stones?
Bright simulated diamonds (cubic zirconia) that add crisp white fire and make the purple read even deeper. Prefer lab-grown diamond or moissanite accents? Reach out and we will tailor it.
Will the finish wear off?
Black ruthenium is a precious-metal finish from the platinum family, more durable than black PVD or oxidized silver. With gentle care — removing it for showers, swimming and lotions — it keeps its rich, smoky depth. If it ever needs refreshing down the line, we are happy to help.
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.
Is it durable enough for daily wear?
Yes. Sterling silver is a firm, wearable metal, the setting secures the stone, and the ruthenium finish adds a durable precious-metal layer. Remove the rings for rough activities to keep the coffin cut and finish pristine.
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 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.
