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The KJJ Diamond Department

Lab Grown Diamonds

The KJJ Diamond Department

Diamonds that don’t cost the earth

Save 90%

This is the Lab Grown version of one of our favourite ever rings over at KJJ Rocks. It’s 90% cheaper in Labs.

Feel a million dollars

Diamond studs never go out of style, these are a 4.00ct pair, and with a white shirt, and big sunnies, you feel a million dollars.

Fast and Free

Once you’ve chosen something sparkly and lovely, postage is free, fast, and fully tracked and insured.

Natural Diamonds / Lab Grown Diamonds

Before / after

The last few years in the jewellery trade have been wild, Lab Grown Diamonds have changed everything. Comparing like for like, certified diamonds of the same spec, the savings to be made by opting for Labs is astonishing. Swipe backwards and forwards to see the difference.



Use the left and right arrow keys to navigate between before and after photos.

Hollywood style

Showstopper engagement rings

This beautiful 6.00 carat solitaire is the largest ring you can order on the website, if you want to go bigger, get in touch, we can go as big as your imagination. This ring is £6995 which is a good yardstick for price, do bear in mind though, some cuts are rarer than others, and old cuts are considerably more expensive and harder to source.

KJJ PRESS, TV, and Red Carpet

Shop the look


Any bloke who doesn’t know what they’re doing when they’re buying a ring needs to come to Katherine. The whole process was effortless from start to finish.Constant contact makes it a relaxing and fun experience, rather than daunting which was certainly what I had anticipated.She really cares about her customer’s special moment and oozes excitement and loves being part the wonderful ‘buying a ring’ experience.Sheer class.Xox



After finding Katherine James Jewellery on Instagram, I knew immediately where I would purchase my engagement ring. I exchanged emails and messages via Instagram before popping in to meet with Claire. From the wealth of advice to the warm presence, the service received from both Claire & Katherine was amazing! My ring is everything I wanted and more! Thanks ladies 😘



I can't praise this company enough! They have just made a bespoke ring for me which is absolutely stunning! I can't stop looking at the way it sparkles! Quality, finish and value for money absolutely fantastic. Customer service brilliant throughout! This is my 3rd purchase from Katherine and her team - can't wait for next one!!



Everything about this company is amazing from communicating, customer care, delivery and the quality of the jewellery is just so very special. My East West engagement ring was everything I wanted & more. Can't wait for our wedding rings. Thank you all so very much and cannot reccomend highly enough.



I have just received the most fabulous ring from Katherine James Jewellery. 
It looked beautiful on their website, but when it arrived it surpassed my expectations. Added to that, their customer service is excellent. Thank you! 



Katherine James Jewellery provides a truly personal service. Nothing is too much, sizes, etc. Sizing, if needed, is swift. Love getting my parcels! I’ve bought several pieces from her over the past three years or so ranging from a little unusual brooch to big, whopping sparklers. I’ve returned items too, and there is absolutely no issue. Big, massive thank you from me.


The Rise and Rise of Oval Cut Diamonds

The Rise and Rise of Oval Cut Diamonds

In the ever-evolving world of engagement rings, trends come and go, but one shape that is currently captivating hearts worldwide is the oval cut diamond. Known for its elegance, versatility, ...

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Understated Luxury - London Style

Understated Luxury - London Style

Embracing Understated Luxury: The Timeless Appeal of Antique Styles and Old Cut DiamondsHello again, diamond lovers! Katherine here, welcoming you back to the KJJ Diamonds blog. This evening, we’re...

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Hatton Gardens Other Hidden Gems

Hatton Gardens Other Hidden Gems

Amid the sparkle and shine of Hatton Garden, there lies a historical treasure that offers a different kind of charm—Ye Olde Mitre Pub.

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KJJ Diamonds


Give us a call on 0800 878 6789 ☎️

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