They will come to you · Hatton Garden

Promise Diamonds

A second-floor suite at 28 Greville Street, ranked #81 of 305 verified London jewellers on 78 analysed Google reviews, every one of them five star across nearly ten years.

★★★★★ 5 79 Google reviews, checked September 2026
Hatton Garden London
Walk-in welcome How you get through the door
#81 Top 100 rank, #81 of 305 verified on review evidence
Location Hatton Garden, London
Appointments Walk-in welcome
Opening hours Mon to Fri 10am to 5.30pm, Sun 10am to 3.30pm
Speciality Diamond engagement and wedding rings, home visits offered

Suite 23, 2nd Floor, 28 Greville St, EC1N 8SU

Find them on Google Maps →

Our verdict

Ranked #81 of 305 on 78 analysed reviews, every one five star across nearly ten years. A quiet Greville Street suite whose consultation travels to you. Check the week before you go: Saturdays are closed.

About

The Consultation That Travels

Promise Diamonds work from Suite 23 on the second floor of 28 Greville Street, with engagement rings across the standard shapes, his-and-hers wedding rings sold as matched pairs, and one service almost nobody else in the quarter offers: a let-us-come-to-you consultation at your home.

Google shows 79 reviews, and every one of them is five star, across nearly ten years. Eight arrived in the past twelve months, and they reply to around a third.

The reviews are short notes on price, service and quality rather than long stories, which fits a quiet suite that trades on referrals. An award-winning-designs page on the site carries the house’s design credentials.

Ten years without a review below five stars, and a consultation that comes to your sofa if the quarter feels too far.

London Engagement Rings
Where they stand

#81 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. Promise Diamonds ranks #81 of 305.

They also appear on three of our ranked lists: Walk-In Friendly, Open Sunday and Highest Rated.

What reviewers say
78Reviews analysed
78Five star
10Years of reviews

The record is brief and consistent: short reviews praising price, service and the finished ring, with nothing below five stars in nearly a decade.

The pace is quiet, a handful of reviews a year, which reads as a referral business rather than a counter chasing volume.

For scale: that record sits in the top 1 per cent for the share of reviews at four stars or better. In plain terms, you should be in safe hands here.

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

Who this suits

The Right Buyer for Promise Diamonds

This suits a buyer who wants the Hatton Garden conversation without the Hatton Garden room, through the home-visit service, or a quiet suite appointment away from the street-level bustle.

The matched his-and-hers wedding ring pairs make the return visit simple. Note the week: open Monday to Friday and Sunday, closed Saturdays, which is unusual for the quarter.

Plan the visit

Seeing more than one jeweller? Two minutes of questions picks who to see for your budget and style.

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For the jeweller

Run Promise Diamonds?

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

Promise Diamonds: Frequently Asked Questions

Do I need an appointment at Promise Diamonds?

Walk-ins are taken at Suite 23, 28 Greville Street, but the suite format suits a booked appointment, and they also offer consultations at your home.

What are Promise Diamonds’ opening hours?

Monday to Friday 10am to 5.30pm and Sunday 10am to 3.30pm. Closed Saturdays, which is unusual for the quarter.

What is the home visit service?

A let-us-come-to-you consultation: the stones and settings come to your home rather than you going to the quarter. Arrange it through their site or by phone.

Why are they ranked #81 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 78 analysed reviews, every one of them five star, across nearly ten years.

Neighbours

Neighbours of Note in Hatton Garden

71 of the Top 100 are in Hatton Garden. Three more worth a place on the shortlist, each with a full profile:

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.