Diamond Kingdom

The Diamond & Jewellery Exchange, 99 Hatton Garden, EC1N 8NX · View on Google Maps · Visit website

Diamond Kingdom trade from the Diamond & Jewellery Exchange at 99 Hatton Garden. Google shows 332 reviews. We analysed 326: 321 are five star, four are four star and one is three star. There is no one- or two-star review anywhere in a record of almost eight years.

The record is accelerating. A hundred and fifteen of the reviews arrived in the past twelve months, around a third of the total, and reviewers name Firnaz and Nabeel throughout.

The terms are written down: 40-day returns, free resizing, complimentary aftercare and a lifetime manufacturer’s warranty, with GIA, IGI and HRD certificates on the stones. Natural diamonds, lab-grown and moissanite are all offered, with prices listed on their site.

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. Diamond Kingdom ranks #15 of 311.

They also place high on one of our ranked lists: No. 7 on our Open Sunday list.

Nineteen reviewers describe the bespoke and design process, 18 mention depth of knowledge and 12 good value for the money. Ten say the ring came out better than they expected, and several describe coming back for later pieces after the first purchase.

The single three-star review is three words long. There is nothing else below four stars to weigh.

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

This suits a buyer who wants the safety net in writing before spending: 40-day returns, free resizing, complimentary aftercare and a lifetime manufacturer’s warranty are all published on their site.

It also suits a Sunday shopper. They open seven days, including Sunday 10.30am to 3.30pm, which puts them at No. 7 on our Open Sunday list.

Appointments are advised rather than required, and prices are listed on their site, so you can benchmark a style before you travel. Moissanite sits alongside natural and lab-grown, which few shops in the Garden offer.

What guarantees does Diamond Kingdom offer?

40-day returns, free resizing, complimentary aftercare and a lifetime manufacturer’s warranty, all published on their website.

What are Diamond Kingdom’s opening hours?

Monday to Saturday 10.30am to 5.30pm and Sunday 10.30am to 3.30pm. They are open seven days a week.

Do they sell lab-grown diamonds and moissanite?

Yes. Natural diamonds, lab-grown diamonds and moissanite are all offered, with GIA, IGI and HRD certificates on the stones.

Why are they ranked #15 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 326 analysed reviews over almost eight years with no one- or two-star review, and 115 from the past twelve months.