18″ Real Black Onyx Crystal Necklace – Genuine Natural Gemstone Jewellery – British Hand Made in Devon – Polished Chalcedony Beads – COA

Description

This elegant Onyx Necklace is hand-crafted in Devon, UK, using 100% genuine natural Black Onyx, professionally cut and polished to achieve a deep, glossy finish. Measuring 18 inches in length, this necklace showcases the bold, sophisticated beauty of one of the most iconic members of the Chalcedony family. The photos show the actual specimen you will receive, ensuring total transparency and confidence in the quality of your jewellery.

All of our Jewellerys are 100% Genuine Specimens & come with a Certificate of Authenticity.

GEOLOGICAL BACKGROUND – ABOUT BLACK ONYX (A CHALCEDONY VARIETY)

Onyx is a variety of Chalcedony, itself a microcrystalline form of Quartz (Silicon Dioxide – SiO₂). True Onyx is recognised for its banded structure, often composed of parallel layers of black and white. However, solid black Onyx—created through natural or traditional enhancement methods—remains one of the most widely used forms in jewellery for its dramatic appearance and durability.

Scientific & Mineralogical Details:

• Mineral Species: Chalcedony (Quartz family)
• Chemical Composition: SiO₂
• Crystal Structure: Microcrystalline quartz fibres
• Mohs Hardness: 6.5–7 (strong and wear-resistant)
• Formation:
• Forms from silica-rich solutions filling volcanic cavities
• Develops in layers via rhythmic deposition
• Often associated with agates and jasper formations

Appearance & Characteristics of Black Onyx:

• Jet-black to deep carbon-black colour
• Smooth polished surface
• Opaque structure with microscopic crystalline texture
• Traditionally enhanced using heat or dye to achieve uniform colour (standard in the gemstone trade)

Black Onyx has been used for jewellery and carvings for thousands of years, valued for its elegant, timeless appearance.

JEWELLERY TYPE – HANDCRAFTED BRITISH ONYX NECKLACE

This necklace is handmade in Devon using polished Onyx beads, arranged to create a beautifully balanced and refined piece suitable for both daily wear and formal occasions.

Jewellery Details:

• Jewellery Style: Necklace
• Length: 18 inches
• Gemstone: Genuine Natural Black Onyx (Chalcedony variety)
• Stone Finish: Smooth, polished beads with a glossy shine
• Metal Findings: Nickel-free, hypoallergenic components (visible in photos)
• Design: Classic, elegant, minimalist and versatile
• Full Sizing: Exact bead size and necklace measurements are shown clearly in the product photos.

Each bead carries its own subtle mineral characteristics, making your necklace completely unique.

A PERFECT GIFT FOR GEMSTONE & JEWELLERY LOVERS

This Black Onyx Necklace is an ideal gift for birthdays, anniversaries, formal occasions, or for anyone who appreciates sophisticated, handcrafted gemstone jewellery. Every necklace includes a Certificate of Authenticity, verifying the natural geological origin of the Onyx.

Celebrate the timeless elegance of real Black Onyx, hand-crafted into a stunning 18″ necklace in the heart of Devon—a bold and classic addition to any jewellery collection.