Watch dealer with a ring side · Mayfair

Diamond Brothers

A South Molton Street watch dealer with a full engagement ring side, ranked #69 of 305 verified London jewellers on 186 analysed Google reviews, 184 of them five star.

★★★★★ 5 191 Google reviews, checked September 2026
Mayfair London
By appointment How you get through the door
#69 Top 100 rank, #69 of 305 verified on review evidence
Location Mayfair, London
Appointments By appointment
Opening hours Mon to Sat 10.30am to 5.30pm, Sun 11am to 4pm
Speciality Luxury watches bought and sold; engagement rings in natural, lab and coloured stones

13 S Molton St, W1K 5QW

Find them on Google Maps →

Our verdict

Ranked #69 of 305 on 186 analysed reviews, 184 of them five star, most earned on the watch side. For a ring, treat it as a Mayfair appointment with a trading house that also builds to order.

Depth of knowledge ×8

About

Watches First, Rings Properly Done

Diamond Brothers lead as a luxury watch dealer, buying, selling and sourcing Rolex, Patek Philippe, Audemars Piguet and Richard Mille from 13 South Molton Street, the pedestrian lane off Oxford Street. The ring side is a full offer rather than a sideline: a create-your-own path starting from a setting with a natural, lab-grown or coloured stone, ready-to-wear, and bespoke commissions.

Google shows 191 reviews. We analysed 186: 184 are five star and two sit at one star, across more than five years, with 69 arriving in the past twelve months. A quarter of reviews carry a reply.

Read the record for what it is: most reviews describe watch deals, as at any trading house. For a ring, this is a by-appointment conversation in Mayfair, open seven days including Sunday.

A South Molton Street trading house where the ring conversation can start with the watch on your wrist.

London Engagement Rings
Where they stand

#69 of 305 Verified London Jewellers

Our Top 100 ranks every London business we could verify as a genuine engagement ring jeweller, 305 of them from a pool of 1,120 candidates, on the strength of their Google review evidence. Diamond Brothers ranks #69 of 305.

They also appear on two of our ranked lists: Outside Hatton Garden and Open Sunday.

What reviewers say
186Reviews analysed
184Five star
5Years of reviews

Depth of knowledge is the theme that comes through, with eight mentions, in a record whose bulk describes the watch trade rather than ring buying. That is the shape of the business, not a warning.

Two reviews sit at one star against 184 at five, in a fast-moving record with more than a third arriving in the past year.

For scale: that record sits in the top 24 per cent of the 305 for review volume. In plain terms, you should be in safe hands here.

Very Trustworthy - The most important aspect of being a watch dealer! Having dealt with Ben from Diamond Brothers over an extended period, I can wholeheartedly recommend him as one of the most reliable dealers in the watch industry.”
Luke Smith · July 2025 · On Google
I recently purchased a Rolex from Diamond Brothers, and I couldn’t be happier with my experience. The watch itself is absolutely stunning. What really made the experience exceptional was the service. Ben is the best! He was knowledgeable, patient, and made sure I found the perfect watch.”
Sara Mouloulid · February 2025 · On Google

Review figures taken from Google and checked in September 2026. We recount them monthly.

Who this suits

The Right Buyer for Diamond Brothers

This suits a buyer already in the watch world, perhaps trading a piece towards the ring budget, who wants both conversations at one Mayfair address, seven days a week.

A buyer who wants a deep ring-specific review record to lean on will find more of it in the quarter; here the evidence is mostly horological, and the ring side is best judged at the appointment.

For the jeweller

Run Diamond Brothers?

This profile is free, built from the public review record and recounted monthly. Correct anything, add your own photography, or ask about our quarterly feature.

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Common questions

Diamond Brothers: Frequently Asked Questions

Do I need an appointment at Diamond Brothers?

Yes, visits to 13 South Molton Street are requested through the site or by phone, seven days a week.

What are Diamond Brothers’ opening hours?

Monday to Saturday 10.30am to 5.30pm and Sunday 11am to 4pm.

Can I part-exchange a watch towards a ring?

Buying and selling watches is the core of the business, so that conversation is natural here. Agree the watch valuation before the ring design starts.

Why are they ranked #69 of 305?

The ranking is built on Google review evidence across every London jeweller we could verify as a genuine engagement ring business. Their record is 186 analysed reviews, 184 of them five star, most describing the watch side.

The evidence behind this guide

This is the only place online that ranks London's engagement ring jewellers on review evidence. I screened 1,120 London businesses, verified 305 as genuine engagement ring jewellers, and re-crawl their Google reviews every month, 57,304 reviews at the last count. Every listing is checked for district, walk-in access, natural or lab-grown stones and opening hours before it appears. The method is published in full on the Top 100, and rankings cannot be bought: editorial policy.