The facts
What ocean Jasper actually is
The species behind ocean Jasper is chalcedony (orbicular), SiO₂ with quartz/chalcedony spherulites; it forms in the trigonal (cryptocrystalline) system.
Orb patterns from radiating spherulitic silica; colours from Fe, Mn and celadonite is responsible for the colour — and the chromophore, not the name, is what decides whether a colour is stable.
On the instruments it reads a refractive index of 1.530–1.539 and a specific gravity of about 2.55–2.70, with none cleavage.
Where ocean Jasper comes from
Commercial material comes from Marovato and Kabamby, Analalava district, Madagascar.
That is the whole list. A single source makes supply fragile and makes any claim of a second origin worth questioning.
How ocean Jasper is treated
Untreated; drusy cavities are natural. The original Marovato seam is worked out, so older material carries a premium and misdescription is common.
We state the treatment on every stone, including when the honest answer is that it cannot be determined. A treatment disclosed is a fact; a treatment discovered later is a refund.
What ocean Jasper is confused with
Watch for Poppy jasper, Orbicular rhyolite and Mookaite — these are what turn up sold under this name.
The separation is rarely a matter of opinion: refractive index 1.530–1.539 and specific gravity 2.55–2.70 settle most of it in a minute, and magnification settles the rest.
What ocean Jasper is used for
The trades that buy ocean Jasper are jewellery, carving and sculpture, decorative objects, architecture and interiors and mineral collecting. They do not want the same thing, and they do not pay in the same unit.
We quote each application in the unit that trade actually buys in, by the carat, by the block or by the piece.
Durability and care
Ocean Jasper is 6.5–7 on the Mohs scale, with none cleavage.
With no cleavage plane to worry about, the practical limit is abrasion rather than breakage, and it takes daily wear well.
Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.
What ocean Jasper costs
Expect roughly $0.50–8/ct, depending on quality.
That is a range, not a quote. Colour, size, clarity, cut and origin move the figure a long way inside it, and the only honest price is one given against a specific stone. Send us what you need and we will price it.
Questions
Is ocean Jasper treated, and how?
Untreated; drusy cavities are natural. The original Marovato seam is worked out, so older material carries a premium and misdescription is common.
Where does ocean Jasper come from?
Marovato and Kabamby, Analalava district, Madagascar. That is the only commercial source.
Is ocean Jasper hard enough to wear every day?
Yes. At 6.5–7 on the Mohs scale with no cleavage plane, it handles daily wear well. The practical limit is gradual abrasion rather than chipping.
How much does ocean Jasper cost?
Indicatively $0.50–8/ct. Colour, size, clarity and origin move the price a long way within that, so treat it as a range and ask for a quote against a specific stone.
What is ocean Jasper confused with?
Most often Poppy jasper, Orbicular rhyolite and Mookaite. A refractive index of 1.530–1.539 and a specific gravity near 2.55–2.70 separate it quickly.
What is ocean Jasper used for besides jewellery?
carving and sculpture, decorative objects, architecture and interiors and mineral collecting. Each of those trades buys it in a different form and a different unit.
Related stones
Looking for ocean jasper?
Tell us the size, the quality and what it is for. We source it, photograph it and quote it — with the locality named.
Ask about ocean jasper