18 Carat Diamond Rings
Established in 1904, Bercotts has earned a reputation for sourcing exceptional diamonds that few jewellers ever encounter. Natural diamonds weighing 18 carats are extraordinarily rare and possess an unmistakable presence. We create bespoke 18-carat diamond rings for engagements and special occasions, handcrafted in Scotland.
Schedule your private consultation with our certified gemologist at our Glasgow store or via video chat wherever you are in the UK.
Why Choose an 18 Carat Engagement Ring?
Owning an 18-carat diamond ring is more than following convention—it’s about possessing a once-in-a-lifetime piece. For many, it marks the beginning of a legacy.
Even within Glasgow’s largest diamond collections, an 18-carat natural diamond remains an extraordinary rarity. At Bercotts, stones of this calibre are typically sourced individually, allowing us to match you with a diamond that meets your exact preferences.
With over a century of expertise and trusted industry connections, we can secure a stone that you will love, that meets the highest standards of cut, colour and clarity.
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Brooklyn Lab Grown Marquise Sidestone Ring
From £1,793 Select options This product has multiple variants. The options may be chosen on the product page -
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Brooklyn Lab Grown Emerald Diamond Sidestone Ring
From £1,755 Select options This product has multiple variants. The options may be chosen on the product page -
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Brilliant Cut Diamond Three Claw Pendant in Yellow Gold
From £600 Select options This product has multiple variants. The options may be chosen on the product page -
Brilliant Cut Diamond Three Claw Pendant
From £600 Select options This product has multiple variants. The options may be chosen on the product page -
Brilliant Cut Diamond Six Claw Pendant in Yellow Gold
From £600 Select options This product has multiple variants. The options may be chosen on the product page -
Brilliant Cut Diamond Six Claw Pendant
From £600 Select options This product has multiple variants. The options may be chosen on the product page -
Brilliant Cut Diamond Rubover Stud Earrings in Yellow Gold
From £1,295 Select options This product has multiple variants. The options may be chosen on the product page -
Brilliant Cut Diamond Rubover Stud Earrings
From £1,280 Select options This product has multiple variants. The options may be chosen on the product page
What Does an 18 Carat Diamond Ring Look Like?
The cut of a diamond affects its brilliance and fire (flashes of white and coloured light) as well as sparkle, making it one of the most important factors in its overall appearance.
For perspective, an 18-carat round brilliant diamond will typically measure around 17.03 mm in diameter and may extend visibly beyond the edges of an average finger. Its substantial size means the stone will overlap into the gaps on either side, creating an impressive visual impact.
Here are the approximate sizes of the most popular diamond shapes at an 18-carat weight.
Diamond shape | Typical face-up size | Average horizontal finger coverage (Size M) |
17.03 × 17.03mm | ~100.8% | |
21.25 × 14.15 mm | ~83.7% | |
17.50 × 12.95 mm | ~76.6% | |
27.20 × 13.60 mm | ~80.5% | |
23.70 × 14.30 mm | ~84.6% | |
14.44 ×14.44mm | ~85.8% |
Ethical Natural & Lab-Grown Diamonds
Every diamond we source comes from an independently verified supply chain. We work exclusively with Gemological Institute of America (GIA)-graded natural diamonds and IGI-graded lab-grown options.
All diamonds are assessed against the universally recognised Four Cs: cut, colour, clarity and carat weight. Diamond colour is graded on a scale from D (colourless) to Z (light yellow/brown).
At Bercotts, we believe in a fifth C: certificate. Included with every purchase, your grading report is an assura
FAQs on 18 Carat Rings
Read expert answers to frequently asked questions about our 18-carat diamond rings for sale.
Is an 18-carat diamond ring suitable for everyday wear?
While an 18-carat diamond ring can be worn every day, it is best suited to those who appreciate statement jewellery and are comfortable wearing a substantial centre stone.
Much like a luxury timepiece, an 18-carat diamond ring is designed to be enjoyed and admired, though owners often take additional care during physical activities to help protect their investment.
Can I view an 18-carat diamond ring in-store?
Due to their exceptional rarity, 18-carat diamonds are not always held in showroom inventory. While we maintain a large range of lab-grown and natural diamond jewellery, stones of this size are often sourced specifically for individual clients.
When you book a personal consultation, we’ll guide you through your options and present graded stones and ring styles that match your brief. We can also arrange for your preferred selection to be viewed in-store before any commitment is made.
What is the best setting for an 18-carat diamond engagement ring?
At Bercotts, you’ll find a wide range of engagement ring settings, including vintage-inspired styles, that accentuate the special properties of an 18-carat diamond. These are popular designs:
Side stone rings, also called shoulder-set designs, feature diamonds along the band that catch light from every angle, making them ideal for those seeking extra brilliance in an engagement ring.
Solitaire styles place full focus on the centre stone with minimal metal visible in a sleek design.
Halo settings frame the centre diamond with smaller stones, adding sparkle and perceived face-up size. A hidden halo is a discreet alternative where one can only see the accent stones from the side view.
Three-stone or trilogy rings feature three diamonds representing the past, present and future. In an 18-carat engagement ring, this typically includes two smaller gems that accentuate the impressive centre diamond.
Is an 18-carat diamond ring the same as an 18ct gold ring?
No. An 18-carat diamond ring refers to the weight of the diamond itself, while an 18ct gold ring refers to the purity of the gold used in the setting.
An 18-carat diamond weighs 18 carats, whereas 18ct gold contains 75% pure gold, alloyed with other metals for enhanced durability and strength.
Does yellow gold suit an 18-carat diamond?
Yellow gold can be an excellent choice for an 18-carat diamond, particularly for those who appreciate traditional jewellery design. The warm tones of a yellow gold engagement ring complement the diamond’s brilliance, helping to emphasise the stone and setting.
Yellow gold also works beautifully in modern two-tone pieces, contrasting with sleek platinum or blush rose gold in either the setting or band.
Is an 18-carat lab-grown diamond more affordable than a natural diamond?
Yes, in many cases, selecting a lab-grown diamond can allow you to upgrade to larger carat sizes or higher-quality settings within the same budget compared to mined stones.
Lab-grown diamonds have the same physical and optical properties as mined diamonds, but they are created in controlled conditions rather than extracted from the earth.
Buy your 18-carat diamond ring on 0% financing over 12 months. Contact us on WhatsApp or call 0141 258 3606 to check your eligibility.
Bercotts: Your Jeweller for Engagement Rings Under 10K
Grounded in our Glasgow heritage of over 120 years, we’ve built the capability to support customers nationwide. Bercotts Jewellers delivers the personal touch of a local jeweller, wherever you are in the UK.
Our extensive collection of engagement rings in lab-grown and natural diamonds is complemented by jewellery for other milestones, including:
Bercotts will remain your committed partner in jewellery through our cleaning and jewellery repair service in our Glasgow workshop. We can also rework family heirlooms for a much-needed style update or to upgrade the stone.
Schedule a private appointment with our in-house gemologist to discuss your options.
