Walk-in bespoke studio · Hatton Garden

Finest 4C’s

A ground-floor studio at Treasure House, 19-21 Hatton Garden, ranked #38 of 311 verified London jewellers on 153 analysed Google reviews, every one of them five star.

★★★★★ 5 156 Google reviews, checked September 2026

Hatton Garden London

Walk-in welcome How you get through the door

#38 Top 100 rank, #38 of 311 verified on review evidence

Location Hatton Garden, London

Appointments Walk-in welcome

Opening hours Mon to Sat 11am to 8pm

Speciality Bespoke engagement rings, GIA and IGI certified natural and lab-grown diamonds

Unit G.1, Treasure House, 19-21 Hatton Garden, EC1N 8BA · View on Google Maps · Visit website

Our verdict

Ranked #38 of 311 on 153 analysed reviews, every one five star across six years. A walk-in bespoke studio with certified stones and the latest weekday hours in the quarter.

Bespoke and design process ×13Depth of knowledge ×6Patient with questions ×5

About

Named After the Thing That Matters

Finest 4C’s is a bespoke jewellery studio on the ground floor of Treasure House, 19-21 Hatton Garden, named after the four Cs every diamond buyer ends up learning. The work runs from custom engagement rings and wedding bands to recreating family heirlooms, with GIA and IGI certified stones across natural and lab-grown.

Google shows 156 reviews. We analysed 153, and every one of them is five star, across nearly six years, with 18 from the past twelve months.

Two practical points stand out. It is one of the genuinely walk-in-friendly doors in the quarter, No. 7 on our Walk-In Friendly list, and the hours run later than almost anyone, 11am to 8pm Monday to Saturday, which suits a visit after work.

A walk-in studio open to 8pm, with 153 analysed reviews and not one below five stars.

London Engagement Rings

Where they stand

#38 of 311 Verified London Jewellers

Our Top 100 ranks every London business we could verify as a genuine engagement ring jeweller, 311 of them from a pool of 1,120 candidates, on the strength of their Google review evidence. Finest 4C’s ranks #38 of 311.

They also appear on four of our ranked lists: No. 7 on our Walk-In Friendly list, and they are on our Highest Rated, Open Late and Lab-Grown Specialists lists.

What reviewers say

153Reviews analysed

153Five star

6Years of reviews

Thirteen reviewers describe the bespoke and design process, six mention depth of knowledge and five patience with questions, in a smaller record whose consistency is the point: nothing below five stars in almost six years.

The reviews repeatedly describe dealing with one person whose work and manner won them over, which fits a studio format rather than a staffed shop floor. They reply to a small share of reviews.

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.

Using my husbands account here - but my words: Muda was absolutely brilliant. I know almost nothing about gems but he guided me through the process and sourced me a beautiful emerald. I know he mostly does diamonds... I was so apprehensive ordering a custom made ring (what if I went back 2 weeks later and he was gone!”

Charles Richards · August 2022 · On Google

My partner and I had been looking for our wedding bands for months and were struggling to find a company that was reliable, professional and affordable. I spoke with Muda at Bijoux Royaux for a few moments and knew I found the right jewler immediately.”

Harshiv Rawal · March 2023 · On Google

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

Who this suits

The Right Buyer for Finest 4C’s

This suits a buyer who wants to walk in off the street and talk to a bespoke studio without booking, which is rarer in the quarter than most people expect. The ready-made collection on the site starts under £2,000, with bespoke above it.

The late hours earn a place on our Open Late list and make this one of the few quarter doors you can reach after a working day. For a wider ready-made selection under one roof, the bigger catalogues elsewhere in the quarter go deeper.

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 Finest 4C’s?

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Common questions

Finest 4C’s: Frequently Asked Questions

Do I need an appointment at Finest 4C’s?

No. Walk-ins are welcome at Unit G.1, ground floor of Treasure House, 19-21 Hatton Garden, though consultations can also be booked through the site or by WhatsApp.

What are Finest 4C’s’ opening hours?

Monday to Saturday 11am to 8pm. Later than almost anywhere else in the quarter.

Are their diamonds certified?

Yes. Stones are GIA and IGI certified, across natural and lab-grown diamonds, and they are on our Lab-Grown Specialists list.

Why are they ranked #38 of 311?

The ranking is built on Google review evidence across every London jeweller we could verify as a genuine engagement ring business. Their record is 153 analysed reviews, every one of them five star, across nearly six years.