Visit one of our stores today!

Free shipping on all orders over £100, special delivery!

0% APR Interest free credit available

Your cart
Your cart is empty

Check out these collections.

Allum & Sidaway Ear Styling Collection
Allum & Sidaway Engagement Collection
Initial Necklaces

Diamond Jewellery

Discover our diamond jewellery collection at Allum & Sidaway, where exceptional craftsmanship meets enduring elegance. Including beautifully crafted diamond rings, refined diamond necklaces, elegant diamond earrings, and many more captivating choices, each piece is designed to be treasured for a lifetime.

Diamond Jewellery

730 Results

Clear filters
Fine Jewellery Jewellery 18ct Yellow Gold 0.40ct Emerald & Diamond Half Eternity Ring 0203083

18ct Yellow Gold 0.40ct Emerald & Diamond Half Eternity Ring

Fine Jewellery

£3,750.00

Fine Jewellery Jewellery 18ct White Gold 0.57ct Sapphire & Diamond Half Eternity Ring 0201286

18ct White Gold 0.57ct Sapphire & Diamond Half Eternity Ring

Fine Jewellery

£3,750.00

Fine Jewellery Jewellery 18ct White Gold 0.75ct Diamond Three Row Scatter Ring 0115235

18ct White Gold 0.75ct Diamond Three Row Scatter Ring

Fine Jewellery

£2,850.00

Fine Jewellery Jewellery 18ct Yellow Gold 0.25ct Diamond Three Row Scatter Ring 0115233

18ct Yellow Gold 0.25ct Diamond Three Row Scatter Ring

Fine Jewellery

£1,495.00

Fine Jewellery Jewellery Platinum 0.83ct Diamond Three Row Scatter Ring 0115234

Platinum 0.83ct Diamond Three Row Scatter Ring

Fine Jewellery

£4,850.00

Fine Jewellery Jewellery 18ct Yellow Gold 3.3mm 0.50ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring 0114459
Fine Jewellery Jewellery 18ct Yellow Gold 3.3mm 0.50ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring 0114459

18ct Yellow Gold 3.3mm 0.50ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring

Fine Jewellery

£2,380.00

Fine Jewellery Jewellery Platinum 2.7mm 0.33ct Diamond Channel Set Half Eternity Ring 0114448
Fine Jewellery Jewellery Platinum 2.7mm 0.33ct Diamond Channel Set Half Eternity Ring 0114448

Platinum 2.7mm 0.33ct Diamond Channel Set Half Eternity Ring

Fine Jewellery

£1,495.00

Fine Jewellery Jewellery Platinum 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring 0114454
Fine Jewellery Jewellery Platinum 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring 0114454

Platinum 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring

Fine Jewellery

£1,485.00

Fine Jewellery Jewellery 9ct Yellow Gold 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring 0114452
Fine Jewellery Jewellery 9ct Yellow Gold 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring 0114452

18ct Yellow Gold 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring

Fine Jewellery

£1,934.00

Fine Jewellery Jewellery 9ct Yellow Gold 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring 0114452
Fine Jewellery Jewellery 9ct Yellow Gold 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring 0114452

9ct Yellow Gold 2.1mm 0.33ct Diamond French Pave Set Half Eternity Ring

Fine Jewellery

£1,125.00

Fine Jewellery Jewellery Platinum 1.9mm 0.25ct Diamond French Pave Set Half Eternity Ring 0114451
Fine Jewellery Jewellery Platinum 1.9mm 0.25ct Diamond French Pave Set Half Eternity Ring 0114451

Platinum 1.9mm 0.25ct Diamond French Pave Set Half Eternity Ring

Fine Jewellery

£1,250.00

Fine Jewellery Jewellery 9ct Yellow Gold 1.9mm 0.25ct Diamond French Pave Set Half Eternity Ring 0114449
Fine Jewellery Jewellery 9ct Yellow Gold 1.9mm 0.25ct Diamond French Pave Set Half Eternity Ring 0114449

9ct Yellow Gold 1.9mm 0.25ct Diamond French Pave Set Half Eternity Ring

Fine Jewellery

£995.00

Fine Jewellery Jewellery 18ct Yellow Gold 2.7mm 0.33ct Diamond Channel Set Half Eternity Ring 0114447
Fine Jewellery Jewellery 18ct Yellow Gold 2.7mm 0.33ct Diamond Channel Set Half Eternity Ring 0114447

18ct Yellow Gold 2.7mm 0.33ct Diamond Channel Set Half Eternity Ring

Fine Jewellery

£1,950.00

Fine Jewellery Jewellery Platinum 2.4mm 0.25ct Diamond Channel Set Half Eternity Ring 0114446
Fine Jewellery Jewellery Platinum 2.4mm 0.25ct Diamond Channel Set Half Eternity Ring 0114446

Platinum 2.4mm 0.25ct Diamond Channel Set Half Eternity Ring

Fine Jewellery

£1,295.00

Fine Jewellery Jewellery 9ct Yellow Gold 2.7mm 0.25ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring 0114444
Fine Jewellery Jewellery 9ct Yellow Gold 2.7mm 0.25ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring 0114444

18ct Yellow Gold 2.7mm 0.25ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring

Fine Jewellery

£2,132.00

Fine Jewellery Jewellery Platinum 2.8mm 0.50ct Princess Cut Diamond Half Eternity Ring 0114437
Fine Jewellery Jewellery Platinum 2.8mm 0.50ct Princess Cut Diamond Half Eternity Ring 0114437

Platinum 2.8mm 0.50ct Princess Cut Diamond Half Eternity Ring

Fine Jewellery

£1,840.00

Fine Jewellery Jewellery 18ct Yellow Gold 2.6mm 0.25ct Diamond Two Row Half Eternity Ring 0114429
Fine Jewellery Jewellery 18ct Yellow Gold 2.6mm 0.25ct Diamond Two Row Half Eternity Ring 0114429

18ct Yellow Gold 2.6mm 0.25ct Diamond Two Row Half Eternity Ring

Fine Jewellery

£1,620.00

Fine Jewellery Jewellery 9ct Yellow Gold 2.7mm 0.25ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring 0114444
Fine Jewellery Jewellery 9ct Yellow Gold 2.7mm 0.25ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring 0114444

9ct Yellow Gold 2.7mm 0.25ct Round Brilliant & Baguette Cut Diamond Half Eternity Ring

Fine Jewellery

£1,320.00

Fine Jewellery Jewellery Platinum 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring 0114443
Fine Jewellery Jewellery Platinum 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring 0114443

Platinum 2.2mm 0.15ct Diamond Millgrain Half Eternity Ring

Fine Jewellery

£1,125.00

Fine Jewellery Jewellery 9ct Yellow Gold 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring 0114441
Fine Jewellery Jewellery 9ct Yellow Gold 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring 0114441

18ct Yellow Gold 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring

Fine Jewellery

£1,345.00

Fine Jewellery Jewellery 9ct Yellow Gold 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring 0114441
Fine Jewellery Jewellery 9ct Yellow Gold 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring 0114441

9ct Yellow Gold 2.2mm 0.15ct Diamond Milligrain Half Eternity Ring

Fine Jewellery

£955.00

Fine Jewellery Jewellery 18ct Yellow Gold 0.50ct Diamond Micro Claw Set Half Eternity Ring 0114435
Fine Jewellery Jewellery 18ct Yellow Gold 0.50ct Diamond Micro Claw Set Half Eternity Ring 0114435

18ct Yellow Gold 0.50ct Diamond Micro Claw Set Half Eternity Ring

Fine Jewellery

£2,083.00

Fine Jewellery Jewellery 18ct Yellow Gold 0.50ct Diamond Two Row Eternity Ring 0114432
Fine Jewellery Jewellery 18ct Yellow Gold 0.50ct Diamond Two Row Eternity Ring 0114432

18ct Yellow Gold 0.50ct Diamond Two Row Eternity Ring

Fine Jewellery

£1,910.00

Fine Jewellery Jewellery 18ct Yellow Gold 2.4mm 0.15ct Diamond Twisted Half Eternity Ring 0114431
Fine Jewellery Jewellery 18ct Yellow Gold 2.4mm 0.15ct Diamond Twisted Half Eternity Ring 0114431

18ct Yellow Gold 2.4mm 0.15ct Diamond Twisted Half Eternity Ring

Fine Jewellery

£1,350.00

Fine Jewellery Jewellery 18ct Yellow Gold 2.3mm 0.25ct Diamond Two Row Half Eternity Ring 0114430
Fine Jewellery Jewellery 18ct Yellow Gold 2.3mm 0.25ct Diamond Two Row Half Eternity Ring 0114430

18ct Yellow Gold 2.3mm 0.25ct Diamond Two Row Half Eternity Ring

Fine Jewellery

£1,540.00

Fine Jewellery Jewellery 18ct Yellow Gold 2.8mm 0.50ct Princess Cut Diamond Half Eternity Ring 0114428
Fine Jewellery Jewellery 18ct Yellow Gold 2.8mm 0.50ct Princess Cut Diamond Half Eternity Ring 0114428

18ct Yellow Gold 2.8mm 0.50ct Princess Cut Diamond Half Eternity Ring

Fine Jewellery

£2,380.00

Fine Jewellery Jewellery Platinum 0.71ct Diamond 3 Stone Ring 0103412

Platinum 0.71ct Diamond 3 Stone Ring

Fine Jewellery

£2,995.00

Fine Jewellery Jewellery 18ct White Gold 0.45ct Diamond Peacock Necklace 1417465

18ct White Gold 0.45ct Diamond Peacock Necklace

Fine Jewellery

£2,355.00

Fine Jewellery Jewellery 18ct Yellow Gold 0.28ct Oval Emerald & Diamond Necklace 1404153

18ct Yellow Gold 0.28ct Oval Emerald & Diamond Necklace

Fine Jewellery

£1,795.00

Fine Jewellery Jewellery 18ct White Gold 0.83ct Oval Ruby & Diamond Double Halo Necklace 1403261

18ct White Gold 0.83ct Oval Ruby & Diamond Double Halo Necklace

Fine Jewellery

£6,390.00

Fine Jewellery Jewellery 18ct Yellow Gold 0.54ct Oval Ruby & Diamond Necklace 1403260

18ct Yellow Gold 0.54ct Oval Ruby & Diamond Necklace

Fine Jewellery

£3,185.00

Fine Jewellery Jewellery 18ct Yellow Gold 1.35ct Sapphire & Diamond Clover Necklace 1402384

18ct Yellow Gold 1.35ct Sapphire & Diamond Clover Necklace

Fine Jewellery

£3,700.00

Georg Jensen Jewellery Jewellery Georg Jensen Silver Offspring Small Diamond Pendant 2204122

Georg Jensen Silver Offspring Small Diamond Pendant

Georg Jensen Jewellery

£450.00

Georg Jensen Jewellery Jewellery Georg Jensen Silver Offspring Medium Diamond Earrings 2202068
Georg Jensen Jewellery Jewellery Georg Jensen Silver Offspring Medium Diamond Earrings 2202068

Georg Jensen Silver Offspring Medium Diamond Earrings

Georg Jensen Jewellery

£950.00

Fine Jewellery Jewellery 18ct White Gold 1.77ct Multi Cut Diamond Hoop Earrings 1220215

18ct White Gold 1.77ct Multi Cut Diamond Hoop Earrings

Fine Jewellery

£6,500.00

Fine Jewellery Jewellery 18ct White Gold 0.92ct Diamond Peacock Drop Earrings 1210557

18ct White Gold 0.92ct Diamond Peacock Drop Earrings

Fine Jewellery

£3,450.00

Fine Jewellery Jewellery 18ct Yellow Gold 0.30ct Diamond Round Hoop Earrings 1220216

18ct Yellow Gold 0.30ct Diamond Round Hoop Earrings

Fine Jewellery

£1,550.00

Fine Jewellery Jewellery 18ct White Gold 0.78ct Oval Ruby & Diamond Double Halo Drop Earrings 1216294

18ct White Gold 0.78ct Oval Ruby & Diamond Double Halo Drop Earrings

Fine Jewellery

£3,500.00

Fine Jewellery Jewellery 18ct White Gold 1.04ct Round Brilliant Emerald & Diamond Stud Earrings 1217202

18ct White Gold 1.04ct Round Brilliant Emerald & Diamond Stud Earrings

Fine Jewellery

£2,250.00

Fine Jewellery Jewellery 18ct White Gold 1.63ct Yellow Diamond Three Stone Halo Ring 0119021

18ct White Gold 1.63ct Yellow Diamond Three Stone Halo Ring

Fine Jewellery

£6,250.00

Load more

Discover Our Selection of Diamond Jewellery

Our immaculate collection of diamond jewellery at Allum & Sidaway features a divine range of options to help you find the perfect choice, whether you’re treating that special someone or yourself. No matter if you’re looking for an everyday contemporary piece or wedding jewellery that your partner will cherish for years to come, you can find exceptional choices to suit all needs and tastes here. 

Laboratory-Grown Diamond Jewellery

In our collection, you can find many exquisite laboratory-grown diamond jewellery pieces. These retain all of the qualities of natural diamonds, while being significantly more affordable and conflict-free. With these choices, you can shop hand-crafted diamond jewellery that not only comes at a much lower price but has also been sourced from fully ethical origins.

If you’d like to know anything more about our UK diamond jewellery collection or any of our other timeless jewellery pieces, contact us today, and a member of our experienced team will gladly assist you.