8mm Natural Black Onyx Beads Round Agate Gemstone Loose Beads for Jewelry Making (45-48pcs/strand) Review (2026)

What is on the strand

Each strand holds approximately 45 to 48 round beads measuring 8mm in diameter, threaded temporarily on a strand about 15 inches long for storage and sale, with a standard 1.0mm hole size that fits most common stringing wire, elastic cord, and silk cord used in bracelet and necklace making. Black onyx is a well established gemstone choice in jewelry making because of its deep, uniform black color and glossy polish, and 8mm is one of the most widely used bead sizes for stretch bracelets, making this strand compatible with most existing bead patterns and stringing supplies a hobbyist is likely to already own.

Working with the stone

Round 8mm beads are an easy size to work with for both beginner and experienced beaders, comfortable to string by hand and forgiving during knotting or crimping since the hole is large enough to pass typical beading wire without much fuss. One strand of 45 to 48 beads covers roughly two adult sized stretch bracelets or a single longer necklace depending on the spacing and any accent beads mixed in, so anyone planning multiple finished pieces or gifting several bracelets will likely need to purchase more than one strand. Black onyx also pairs well with metal accents like gold or silver spacers, since the flat black tone reads as neutral against most metal finishes.

Natural stone characteristics

Because these are natural gemstone beads rather than glass or synthetic imitations, some variation between individual beads is expected and normal, including occasional small surface pits, faint banding, or slight differences in shine from one bead to the next within the same strand. This is a defining feature of natural onyx rather than a flaw, and it is part of what distinguishes genuine gemstone strands from perfectly uniform glass or acrylic alternatives sold at similar sizes. Buyers who need beads that are visually identical to one another, for example a matched pair of earrings, may want to hand select beads from the strand rather than assuming full uniformity.

Value and typical uses

At 8mm, this bead size sits in the sweet spot most gemstone bracelet patterns are designed around, so the strand is broadly compatible with existing project instructions and with other 8mm strands from different stone types for multi stone designs. Because the natural material carries genuine mineral characteristics rather than a dyed or reconstituted look, the black onyx here suits both simple single stone bracelets and more elaborate designs mixing in other neutral or accent gemstones. One strand is a reasonable amount for testing a design or making a single gift, though production scale beaders or anyone making several bracelets at once should plan to order multiple strands up front.

Bottom line

This is a straightforward, dependable strand of natural black onyx in one of the most commonly used bead sizes for jewelry making, and it fits neatly into most existing gemstone bracelet or necklace patterns. The natural material means some bead to bead variation is normal and should be expected rather than treated as a flaw. For anyone building a rotation of neutral, versatile gemstone bracelets or looking for a dependable black accent stone, this strand covers the basics well, keeping in mind that a single strand only stretches to a couple of finished pieces.

Frequently asked questions