Black Onyx Bead Necklace 4mm
A fine line of black.
Onyx is chalcedony, a material made of fine silica fibres, mainly quartz with variable amounts of moganite. In this necklace, polished 4mm beads form a fine black line around the neck. Small highlights follow each curved surface, keeping the beads distinct. Wear it against bare skin or a pale shirt, on its own or with a separately selected Keystone at the front.
Ten checks you can run on any strand before you buy: the BE. Stone Buying Checklist.
Materials & construction
Bead size: 4mm
Length: 43cm (approximately 16.93 inches); one length.
Delivery & returns
Made to order: allow 3–7 business days before dispatch. United States: 6–12 calendar days after dispatch, with an estimated total of 7–15 business days from order to arrival. Duties are prepaid. Return requests are accepted within 14 days of receipt. Read full shipping terms →
2-year warranty
The two-year warranty covers verified material and craft defects. Natural stone characteristics and normal wear are not defects.
- Origin
- Mexico
- Crystal Type
- Fibrous microcrystalline silica
- Colour Source
- Natural black colour
- Composition
- SiO₂; quartz with variable moganite
- Crystal System
- Trigonal quartz; variable monoclinic moganite
- Hardness
- Mohs 6.5–7
- Colour Cause
- Natural black colour. The colour-causing inclusion chemistry of this lot has not been tested.
- Treatment
- None. No heat, no dye, no irradiation.
Chalcedony
This lot is untreated: no heat, dye, coating or artificial irradiation.
Optical character of opaque chalcedony
Black colour continuity
Surface integrity
Studio assessment of this lot
Approximately 20% of inspected material enters BE. production. The remaining 80% is returned to supplier or set aside for non-production use.
StudioThe lowest material reading is Standard.
SignatureThe lowest material reading is Strong.
HeritageAll three material readings Exceptional, and Treasure Exceptional too.
Shares are BE.'s own estimate from its buying, not a statistic.
Selected natural Black Onyx lot received with source documentation.
Weighed, photographed, and scored across Transparency / Tone / Texture / Treasure. Composite tier assigned: Signature. Lot 2026.08 record issued.
Lot released to production. Each bead re-inspected against the grading record before stringing.
Begins the day your order is placed. 3 to 7 business days, by hand, by one craftsman.
Final inspection before dispatch. Shipped with order record. The lot number matches this card.
Onyx is chalcedony: fine, fibrous silica made mainly of quartz with variable amounts of moganite. Here, polished 4mm beads form a narrow black line around the neck.
This 4mm strand is graded Signature. Transparency and Tone: Exceptional. Texture and Treasure: Strong. Lot 2026.08, Stone Origin Record BE-ONN-4-1008.
The Anchor series. A fine line of black.
Field assessment · BE. Studio · 2026Black Onyx Bead Necklace 4mm
Questions before purchase
FAQ
The five questions buyers ask most before pressing add to cart.
01Is this stone treated in any way?+
This piece uses natural, untreated stone. No heat, dye, coating or artificial irradiation is applied. Its lot details are recorded on the Stone Origin Record supplied with the piece.
02Will the colour look exactly like the product photos?+
Natural stone changes with light, angle, and screen settings. Product photos are edited for clarity, but the material may read deeper, softer, or more muted in daily light.
03How do returns and refunds work if I change my mind?+
Email us within 14 days of receiving your order to start a return. The piece must be unworn, undamaged, and in its original packaging. Return shipping is the buyer's responsibility. Once we receive, inspect, and approve the return, your refund is processed to the original payment method within 5–10 business days.
04How long does delivery take?+
Allow 3–7 business days for studio preparation. United States delivery takes 6–12 calendar days after dispatch, with an estimated total of 7–15 business days from order to arrival. Other supported destinations take 5–14 business days after dispatch; the overall estimated total is 7–21 business days, depending on destination. These are estimates; remote destinations, customs procedures, and carrier conditions may extend them. Duties and import taxes are prepaid by BE. Orders over €300 ship free; below that threshold, shipping is shown at checkout. Full destination restrictions are listed on the Shipping page.
05What arrives in the box?+
Your piece arrives in the BE. box with its Stone Origin Record and BE. brand series card. Gift wrapping is available at checkout if it is going to someone else.
THE STONE BUYING CHECKLIST
Ten checks for reading any strand, ours or anyone's: what to look at, and what to ask. It comes with your first email, then one stone at a time from the studio.
By subscribing you agree to receive emails from BE. Unsubscribe anytime.
Sent. Check your inbox.