Tandon Gems
Black Onyx 6X14mm Faceted Rectangle (Double Drill) gemstone bead strand
Black Onyx 6X14mm Faceted Rectangle (Double Drill), additional view
Black Onyx 6X14mm Faceted Rectangle (Double Drill), additional view

Natural stones vary. Your strand will match these photos in colour and size range, not bead for bead. Photographed under daylight-balanced light with no colour correction.

Black onyx and black spinel

Black Onyx 6X14mm Faceted Rectangle (Double Drill)

$22
per strand
In stock. Free US shipping over $100. To order, message us with the SKU and we send an invoice you can pay online.
Reserve for pickup at Denver, Sep 10 to 13, 2026

Specifications

SKUGS626
StoneBlack onyx and black spinel
ShapeRectangle
Bead size6x14mm
CutFaceted
Color
WeightOn request
Hardness (Mohs)6.5 to 7
OriginCut in Jaipur, India
AvailabilityIn stock

Onyx is a variety of cryptocrystalline or chalcedony quartz. The black color is most popular among Onyx. A black Onyx gemstone believed to have healing and spiritual properties, and also called as a protective stone. It is worn to release any sort of negativity, bring powers of protection, etc.

What it makes

Rectangles are used for pendants, bar necklaces, geometric earrings. Measured width by length, e.g. 15x25mm; usually drilled lengthwise, or top-drilled across the short edge. More about rectangles.

Strand calculator. Pick a finished length; we allow 1.5 inches for the clasp and findings.
70 beads of 6mm for a 18-inch piece, about 3 strands at roughly 34 beads per 8-inch strand.
Estimate. Natural beads vary in size; buy one extra strand if the count is close.
The story of Black onyx and black spinel

Two stones, one color, told apart by weight and light.

On the tray, a strand of black onyx reads as one unbroken color, the facets catching light in small flat planes with no gray creeping in at the edges. Black spinel sits next to it and looks glassier, the light coming back harder off each facet, and the strand feels heavier in the hand than its size suggests. Makers reach for both when a piece needs a hard stop, a line of true dark against silver, brass, or pale stone.

Few stones carry as much unhappy lore as onyx. Old writers tied it to quarrels, bad dreams, and gloom, and for centuries people looked for ways to counter those purported effects rather than set the stone aside, since they liked the look of it too much to give it up. Alongside that darker reading runs a steadier one: in crystal tradition both black onyx and black spinel are called protective, grounding stones, held to steady the wearer and turn away what is unwanted. It is said that a dark stone worn close keeps a person in their own footing. All of this is tradition and belief, not fact.

Beliefs about stones are tradition, not advice. Watch the film and read the full story.

About Black onyx and black spinel

Two stones. natural solid-black chalcedony is rare. Black spinel is natural magnesium aluminum oxide, Mohs 8, from Thailand, Myanmar and Sri Lanka.

Both take daily wear and ultrasonic; keep onyx out of bleach.

Full stone guide

More black onyx and black spinel

Same shape, other stones