Meteoritic black diamond (carbonado) 2.5 ct center · white moissanite accents · silver band
Dimensions
Center stone 8 × 4 mm · adjustable open band
Origin
Qinghai-Tibet Plateau · Third Pole
Element
Metal
Edition
One of one — a single piece, sold once
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Free US shipping
On every order this week
Arrives in 7–12 days
Tracked from our studio
30-day returns
Full refund, on us
How we describe a piece
Every listing says what the piece is made of, where the material was found, and what we could not verify.
There are no certificates here, because in this trade most certificates are marketing paper. What you get
instead is the piece exactly as photographed — same materials, same hand-stringing, described down to
the clasp — and thirty days to change your mind.
— STELLAR BONE
Ouroboros · 衔尾 — a ring of space-born black diamond
The serpent that eats its own tail is one of the oldest symbols we have: no beginning, no end, matter returning to itself forever. Ouroboros is our ring of carbonado — meteoritic black diamond, a 2.5-carat dark stone that earth's geologists still argue about. Carbonado is found almost nowhere on earth's surface, is older than any terrestrial diamond, and shows none of earth diamond's crystal habit. One leading hypothesis: it arrived from space. This one is cut, set in a silver band with white moissanite accents, and finished by hand.
What makes carbonado different
Earth diamonds grow in mantle rock and carry its mineral fingerprints. Carbonado — black diamond — is polycrystalline, porous in places, and dated at up to 3.8 billion years; it is found only in Brazil and the Central African Republic, in deposits that some researchers attribute to a pre-solar origin. We present it honestly: the meteoritic origin is a documented scientific hypothesis, not our invention, and we say so on every listing rather than inventing certainty we don't have.
Size and wearing
The band is silver, adjustable — one size carries most fingers comfortably. The 2.5 ct carbonado sits low in the setting so it can be worn every day; white moissanite traces the band like a constellation. Natural carbonado surfaces vary stone to stone — that is the material, not a flaw.
Honest disclosure, no certificates
We don't print "certificates" — most certificates in this trade are marketing paper. The listing states what the stone is, the scientific debate around its origin, and what remains unverified. If your ring ever disagrees with the listing, return it within 30 days for a full refund, on us.
Care
Carbonado is among the toughest diamond forms — it takes daily wear without ceremony. Wipe with the included soft cloth; keep silver away from pools and hot springs. One of one: when it sells, it is gone.
Metal begets water: silver-white is metal's own color among the five phases, and the coiled band embraces a stone the shade of deep water — black being water's hue. The serpent's circle returns to itself, first and last.
Yin · Yang — Coiled silver band = yang (bright, outward, moving); black diamond = yin (still, deep, absorbing). One circle holds both.
“A falling star, reaching the earth, becomes stone.” — Sima Qian, Records of the Grand Historian, c. 91 BC
Cultural heritage narrative only. We make no functional or metaphysical claims.
Stone & Iron
Two halves of one circle
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The Stone — Ink of the Night Sky
A 2.5 ct black marquise, 8 × 4 mm, cut from meteoritic black diamond — carbonado, the darkest form of carbon. In lamplight it opens into deep blue-black fire, ringed by white moissanite like stars at the edge of night.
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The Serpent — a Circle Sealed
The band coils once around the finger and ends where it begins — the ouroboros, drawn by alchemists and jewelers for two thousand years as the sign of what never ends. Its scales are white moissanite, set one by one down the silver spine.
Specimen Details
Origin
Qinghai-Tibet Plateau · Third Pole
Material
Meteoritic black diamond (carbonado) 2.5 ct center · white moissanite accents · silver band
Dimensions
Center stone 8 × 4 mm · adjustable open band
Finish
Prong-set marquise center · pavé coil band · hardness 9–9.4
Good to know
What is a meteoritic black diamond?
The 2.5 ct black marquise is carbonado — black diamond of meteoritic origin, the polycrystalline "ink of the night sky". At 9–9.4 on the Mohs scale it is one of the hardest natural materials you can wear: no special care, wear it every day for the rest of your life.
Wearing & caring for your Ouroboros
The stone needs nothing from you. To keep the silver band and moissanite pavé bright, wipe with the soft cloth included and set the ring aside when using household chemicals or perfume. A gentle patina on silver over years is the metal aging, not damage.
Sizing — an open band that adjusts
The band is an open setting — gently flexible, made to fit most ring sizes without resizing. Made-to-order customization is accepted; please allow 25–45 days of making time.
Our honest-materials statement
We state everything we know about each piece — class, origin, materials — and admit what we don't. No inflated stories, no invented provenance. If your piece ever disagrees with the listing, return it within 30 days for a full refund, on us.
ONE of ONE
There is only one
Ouroboros is a single piece — the exact ring shown, never to be repeated. When it finds its person, the design retires with it. If it doesn't match the photos and specs, return it within 30 days for a full refund.
The Universe Is Old. Hold a Piece of It.
New one-of-one pieces are released as they are found and finished. Join the list to hear first.
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