£44.99
Low in stock
SAVE 20% WHEN YOU BUY THE ONYX SET!
Add bold sophistication to your style with the ONYX Byzantine Necklace by Alfred & Co. London. Featuring a sleek 5mm flat-link design in contrasting silver and black stainless steel, this men’s chain delivers a powerful balance of elegance and ruggedness.
The flat Byzantine link ensures a smooth, comfortable fit on the neck, while the unique colourway adds standout character to any outfit—day or night.
Crafted from premium-grade stainless steel, the ONYX is 100% waterproof, sweatproof, and tarnish-resistant, making it the perfect chain for everyday wear or special occasions.
Width: 5mm
Length: 20 inches (50.80cm) + 2-inch extender (fits up to 22 inches)
Material: High-quality stainless steel (Silver & Black finish)
Clasp: Secure lobster clasp
Style: Flat Byzantine link – comfort-focused and fashion-forward
✓ Unique Flat Byzantine Design – Stylish, Comfortable, and Masculine
✓ Premium Silver & Black Steel – Rugged Meets Refined
✓ Adjustable Fit – 2-Inch Extender for Perfect Length
✓ Waterproof, Sweatproof & Tarnishproof – Built to Last
✓ Ideal Gift – Comes with Optional Luxury Packaging
✓ Fast UK Delivery
✓ 2-Year Warranty
✓ Designed in London
Complete the look: Pair it with the matching ONYX Bracelet to level up your accessories game.
| 5 star | 100% | |
| 4 star | 0% | |
| 3 star | 0% | |
| 2 star | 0% | |
| 1 star | 0% |
The average men’s necklace length is 18-20 inches (45cm – 51cm). If unsure, for slimmer & smaller builds (5 feet 6 inches and below) we’d suggest 18 inches. For bigger and taller builds (5 feet 7 inches +) we would recommend 20 inches.
The average women’s necklace length is usually 16-18 inches.
The average men’s bracelet size is 8.0 inches, or 20.32cm.
| Persons Build | Recommended Size Inches | Recommended Size CM |
| Small | 6 – 8 Inches | 15.24 – 20.32cm |
| Medium | 8 – 8.5 Inches | 20.32 – 21.59cm |
| Large | 9 – 9.5 Inches | 22.86 – 24.13cm |
| Extra Large | 9.5 Inches+ | 24.13cm+ |
The average women’s bracelet size is 7.50 inches, or 19.05cm.
| Persons Build | Recommended Size Inches | Recommended Size CM |
| Small | 5 – 6.5 Inches | 12.70 – 16.51cm |
| Medium | 7.0 – 8.0 Inches | 17.78 – 20.32cm |
| Large | 8.5 – 9.0 Inches | 21.59 – 22.86cm |
| Extra Large | 9.0 Inches+ | 22.86cm+ |
Generally we would recommend that customers measure the circumference of their wrist, using a piece of string (or anything you can find such as a phone charger cable!), and then add anywhere between 1/2 inch to 1 inch depending on how loose or tight you would like it to fit.
The average men’s ring size is size 10 (USA) which is T 1/2 (UK)
| Persons Build | Recommended Ring Size (USA) | Recommended Ring Size (UK) |
| Small | 8 | Q |
| Medium | 10 | T 1/2 |
| Large | 12 | Y |
| Extra Large | 12.50 | Z |
| LOCATION | SERVICE | ESTIMATED DELIVERY TIME | PRICE |
| UK For Orders £60+ | STANDARD (orders £60+) | 2-4 WORKING DAYS | FREE |
| UK | STANDARD (orders below £60) | 2-4 WORKING DAYS | £2.99 |
| UK | EXPRESS | 1-3 WORKING DAYS | £4.99 |
| UK | NEXT DAY (order before 2pm) | 1-2 WORKING DAYS | £5.99 |
| EU | STANDARD | 5-10 WORKING DAYS | £5.99 |
| EU | EXPRESS | 3-7 WORKING DAYS | £7.99 |
| USA | STANDARD | 5-10 WORKING DAYS | £4.99 |
| REST OF WORLD | STANDARD | 5-10 WORKING DAYS | £4.99 |
Warranty included on all our pieces for 100% peace of mind and hassle free returns.*
All pieces are 100% sweat-proof, waterproof, and life-proof!*
Purchases made on or after 1st November have extended returns – up until 6th January to return.
*Subject to T&Cs.Â
| Weight | 137 g |
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| Dimensions | 48 × 0.02 in |
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Excellent quality necklace, looks amazing and very happy with the purchase
Stunning chain
Great product, good service.
I bought this with the bracelet for my sons 16th birthday! It was a great fit I got 20inch, just right length not too long. It’s great quality and nice solid weight. Delivery was quick. And I got 15% discount. Will come back here again. Thankyou.