A miniature forest, sealed in shadow. This hexagon coffin moss agate engagement ring set centers a hand-selected natural green moss agate — each stone its own private garden of dendrites — framed by a bold coffin-hexagon silhouette and set in 925 sterling silver finished in dark, smoky black ruthenium. Earthy green meets gothic edge, and the two pieces stack into one complete bridal set.
Natural green moss agate
Solid 925 sterling silver
Black ruthenium finish
Hexagon coffin cut
Two-piece bridal set
Free velvet gift box
A coffin-cut silhouette with earthy soul
The hexagon coffin cut is where dark romance and nature-inspired design meet: hard, architectural geometry wrapped around a soft, living green stone. It is a design for anyone who wants an alternative to the conventional solitaire without giving up meaning. Measuring roughly 7.0 x 11.0 mm (about 1.7 ct), the center stone commands the finger. You’ll find the same spirit across our gothic engagement rings and the wider moss agate engagement rings collection, and our guide to the best cuts for moss agate shows why the hexagon suits this stone so well.
The engagement ring
Holds the hexagon coffin-cut moss agate, flanked by simulated diamond accents that sharpen its geometry — the statement piece of the set.
The matching band
A coordinating band designed to nest seamlessly against the engagement ring, completing the bridal stack. Lovely worn alone from our moss agate promise rings.
The natural moss agate
Moss agate isn’t dyed or treated to look green — the color comes from natural mineral inclusions suspended inside clear chalcedony, forming what look like tiny ferns and forests frozen in stone. Because these patterns form in the earth, every moss agate is one of a kind: yours will share the same lush green character as our photos, with its own subtle variation in the moss — the mark of a genuinely unique gem, not a flaw. See the same one-of-a-kind character across our moss agate couples rings, and our moss agate engagement ring guide covers everything worth knowing.
The simulated diamond accents
Sparkling simulated diamonds trace the shape of the moss agate, adding a crisp flash of white against the dark band that makes the green glow even deeper. They are a bright, budget-friendly way to add classic engagement-ring shimmer without competing with the center stone.
The black ruthenium finish
The set is solid 925 sterling silver finished with black ruthenium, a precious metal from the platinum family. It reads as a deep, smoky gunmetal — a blackened-silver tone with real depth and antique warmth — rather than a flat, pure jet-black. That is exactly what makes it beautiful here: the charcoal patina throws the green moss agate into high relief and gives the set a moody, dark-romantic mood a matte pure-black coating can’t. It is skin-safe and won’t turn your finger. For the full story, see our explainer on what black ruthenium is.
What moss agate symbolizes
Long known as the “stone of new beginnings” and the gardener’s talisman, moss agate is tied to growth, abundance and steady, rooted love — a fitting emblem for a relationship you intend to nurture. Paired with the quiet defiance of a black-metal band, it’s devotion on your own terms. For more on dark stones and their meaning, our guide to black rings for women is a lovely read.
Specifications
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Metal Solid 925 sterling silver with black ruthenium finish
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Finish tone Deep gunmetal / blackened-silver (not pure jet-black)
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Center stone Natural green moss agate, hexagon coffin cut, approx 7.0 x 11.0 mm (~1.7 ct)
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Accents Simulated diamonds
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Set includes Engagement ring + matching band (two pieces)
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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’re unsure or between sizes, reach out and we’ll help, and resizing is available starting from a modest fee. To keep the moss agate and black ruthenium at their best, remove the rings before showering, swimming, cleaning or applying lotions and fragrance, and store them dry in the velvet box between wears. Buff only with a soft, dry cloth — skip abrasive polishes, which are made to strip dark finishes. Wondering how the stone handles daily life? Our article on whether moss agate is durable covers it.
Frequently asked questions
Is the black ruthenium pure black?
It is a deep, smoky gunmetal — a rich blackened-silver tone rather than a flat, pure jet-black. That is the beauty of it: the charcoal depth throws the green moss agate into relief and gives the set an antique, dark-romantic warmth a matte pure-black coating can’t match.
What is the black ruthenium finish?
Ruthenium is a precious metal from the platinum family, applied over solid 925 sterling silver for a deep blackened patina. It is skin-safe, won’t turn your finger, and makes the moss agate’s green look even richer.
Is the moss agate natural?
Yes. Each moss agate is a genuine natural stone, and its green mossy inclusions form in the earth — never dyed or painted. That is why every stone is unique.
Will my stone look exactly like the photos?
It will share the same rich green character, but the exact moss pattern is one of a kind — a hallmark of natural moss agate. No two are ever identical, so yours is truly its own.
Does this come as a set?
Yes — it includes the hexagon coffin moss agate engagement ring plus a matching band designed to nest alongside it. The band can also be worn on its own as a promise or stacking ring.
What are the accent stones?
Bright simulated diamonds set around the center to sharpen the geometry and add a crisp flash of sparkle against the dark band.
What metal is it made from?
Solid 925 sterling silver finished in black ruthenium — hallmarked sterling, not vermeil and not solid gold.
Is moss agate durable enough for daily wear?
Moss agate sits around 6.5 to 7 on the Mohs scale, well suited to everyday wear with normal care. Avoid hard knocks and remove the rings for rough activities to keep the stone pristine.
Will the finish rub off?
With everyday care the blackened finish wears beautifully. Remove the rings for showering, swimming and workouts, keep them from lotions and harsh chemicals, and buff only with a soft dry cloth — never an abrasive polish.
What size should I order?
Select your ring size at checkout. If you’re 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.
Can I see other moss agate designs?
Absolutely. Explore the full moss agate engagement rings collection and our moss agate couples rings to find your pairing.
