The Diamond Store London Review: Is It Trustworthy

Anyone shopping for diamond jewellery online knows the question that almost always comes first: can you trust the seller? The Diamond Store London has been around since 1956, but with thousands of items and a strong marketing presence, separating the brand’s promises from reality takes a closer look.

Year Established: 1956 · Product Range: Over 6,000 items · Guarantee: 5-Year Guarantee · Delivery: Free Delivery

The table below summarises the key factual claims made by The Diamond Store and the sources behind them.

Is The Diamond Store London Trustworthy?

Official Independent Reviews

• Trustpilot rating listed as “Excellent” on the brand’s own independent-reviews page (The Diamond Store independent reviews page)
• Feefo describes The Diamond Store as “The UK’s leading online diamond jewellery specialists” (Feefo customer review platform)
• REVIEWS.io confirms a 30-day money-back guarantee and a certificate of authenticity (REVIEWS.io)

Six thousand items and a five-year warranty sound solid, but trust also depends on how a company handles problems. A negative review on REVIEWS.io reports white gold tarnishing within days — a reminder that individual experiences vary.

Customer Feedback on Trustpilot

• The Diamond Store states that review requests are sent after a verified purchase on Trustpilot (The Diamond Store independent reviews page)
• Trustpilot displays mixed reviews — positive remarks alongside complaints about quality (Trustpilot)

Awards and Guarantees

• 5-Year Guarantee covers manufacturing defects (REVIEWS.io)
• Award-winning service claimed on the official site (The Diamond Store official site)

The implication: the guarantee is a genuine safety net, but “award-winning” is self-reported and not independently verified beyond the site’s own marketing.

Is The Diamond Store a Good Company?

Company Reputation

• Marketed as “The UK’s Largest Online Jewellers” (The Diamond Store official site)
• Founded in 1956 — long history in the industry (The Diamond Store official site)
• Advertises “Fine jewellery that doesn’t cost the earth” (The Diamond Store UK Facebook page)

The pattern: the company leans heavily on heritage and sustainability messaging, but independent review platforms show a more nuanced picture — some customers are delighted, others disappointed.

Ethical Sourcing and Conflict-Free Diamonds

• Claims to offer “Ethically Sourced, Conflict Free Lab, Natural Diamond” (The Diamond Store UK Instagram)
• No third-party certification (e.g., Kimberley Process) explicitly mentioned in available sources

Social Media Presence

• Over 222,000 Facebook likes (The Diamond Store UK Facebook)
• Active Instagram with tagline “Fine jewellery that doesn’t cost the earth” (The Diamond Store UK Instagram)

What this means: strong social proof can boost confidence, but it doesn’t replace individual product due diligence.

Who Is the Founder of The Diamond Store?

Jeremy Kanzen – Co-Founder and CEO

• Jeremy Kanzen is named as Co-Founder and CEO on the official site (The Diamond Store official site)
• Background: mentions the intricate process of diamond selection in a video description (The Diamond Store official site)

Six decades of family leadership is a strong signal — but the public profile of the founder remains limited, which may matter to buyers who want to know exactly who stands behind the business.

Company History Since 1956

• Established 1956, British jewellers (The Diamond Store official site)
• Transitioned to online focus, now “the UK’s largest online jewellers” (The Diamond Store official site)

The trade-off: a long history suggests stability, but the shift from brick-and-mortar to pure online means the company’s reputation today rests almost entirely on e‑commerce fulfilment.

How Long Does The Diamond Store London Take to Deliver?

Standard Delivery Times

• Free delivery is advertised (REVIEWS.io)
• Exact standard timeframe (e.g., 3–5 days) not listed on available pages (The Diamond Store official site)

Tracking Your Order

• Order tracking is available, but details not specified (The Diamond Store official site)
• Customer service contact: 0845 084 1200, sales@thediamondstore.co.uk (REVIEWS.io)

The implication: the company promises free delivery and tracking, but the lack of concrete shipping windows is a gap that may frustrate time-sensitive shoppers.

How Much Does a 1 Carat Diamond Cost in the UK?

The 4 Cs: Cut, Clarity, Color, Carat

• Price varies dramatically based on cut, clarity, color, and carat weight (The Diamond Store official site)
• The Diamond Store offers both natural and lab-grown diamonds (The Diamond Store UK Instagram)

Five variables, one rule: a well-cut 1‑carat lab diamond from The Diamond Store can cost significantly less than a natural stone with the same specs.

Price Range for 1 Carat Diamonds

• Specific current pricing for a 1‑carat diamond at The Diamond Store is not publicly listed in available sources
• General UK market range for 1‑carat natural diamonds: £2,500–£10,000+ (industry estimates)

The pattern: without a visible price tag, comparison shopping is harder. Smart buyers should request a quote and compare across at least three jewellers.

Engagement Ring Spending Guidelines

• Traditional rule: spend 2–3 months’ salary on an engagement ring (The Diamond Store official site)
• Many modern finance advisors suggest spending based on personal budget, not a rigid formula

The catch: sticking to a 2–3 month guideline may be outdated for today’s priorities. Focus on what fits your finances and what your partner actually wants.

“Fine jewellery that doesn’t cost the earth.”

The Diamond Store UK (Facebook page)

“Our Co-Founder and CEO, Jeremy Kanzen, shares the intricate process behind selecting the finest diamonds.”

The Diamond Store (official site, video description)

“Est 1956 | Handcrafted in the UK | Ethically Sourced | Conflict Free Lab | Natural Diamond | Gemstone”

The Diamond Store UK (Instagram description)

The Diamond Store London has been selling diamonds since 1956, but the information that matters most — clear delivery times, visible pricing, and independent sourcing certifications — remains partially hidden. For UK shoppers considering a purchase, the smartest move is to call customer service, ask for a current 1‑carat quote, and read recent reviews on platforms like Trustpilot and REVIEWS.io before clicking ‘buy’.