Unheated sapphire & heart cut diamond ring in platinum

4.82ct cushion cut blue sapphire with Gem & Pearl Laboratory report confirming that the sapphire is unheated, flanked by 0.90ct pair of heart cut diamonds in F colour VS clarity. Gemstones mounted in platinum ring, wedfit. It is rare to find such a sparkling and exquisite unheated sapphire of this quality. Price £17,999

Our Latest News

Saturday 22nd November

To celebrate 20 years of trading, Just Gems is having a SALE. There is 50% off certain pieces of jewellery. Search on SALE in Design drop down on our jewellery page.

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Upcoming Events

Monday 5th January ~ 12:00pm

2026 Gem Talks - first quarter talks will be in Tetbury, Broadheath, Fernhill Heath, Cirencester, Prestbury, Compton Abdale, Pinvin, Upton on Severn, Twyver, Dumbleton, Droitwich & Painswick. We are taking bookings for the first quarter of 2027, please contact helen.plumb@just-gems.co.uk or call 07732 835704 if you would like to book Helen to give your group a talk on Gems they will enjoy and remember. Please check the feedback on our latest talks on the About/Testimonials page of our website.

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Explore all our Jewellery

The Just Gems Shop

27 North Street, Winchcombe, Gloucestershire

The shop has a wide selection of carefully sourced unmounted gems. If you would like to choose a loose gem in any size, shade or cut, we have a large number of suitable stones just waiting for you! Our gems are collected from personal contacts of Helen Plumb, relationships she has developed over more than twenty years of working with the international gemmological trade. Wherever possible, our stones are ethically sourced and many come from known mines in Brazil, Afghanistan, East Africa, Sri Lanka and elsewhere.

We also love pearls at Just Gems, and offer a matching service to make up earrings, bracelets, pendants or necklaces that will enhance your own pearl jewellery. We restring pearls in our workshop and can replace or repair damaged clasps. Please note that we only mount natural gemstones and restring real pearls (cultured or natural) and gemstones. We do not work with simulants.

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From our customers…

Mrs S writes…

Just to thank you for giving us such a well-constructed and fascinating talk, which was very much enjoyed by all our members. It was particularly good to learn of all the more unusual gems with which you work.

Miss W writes…

Just a quick note to say how much I like my lovely engagement ring! I am so pleased with every aspect of the ring. Now I stare at it so much, I appreciate the value of having a ring that is beautiful from all angles. The details of the setting are extremely elegant, and not does it look good itself, but it also lets in lots of light to the stones. I am continually surprised by how bright and eye-catching the diamond can be (which I imagine is not just down to the quality of the stones themselves but also to the round brilliant shape and excellent cut quality), but also the sapphires too . It is also interesting note how the colour of sapphires can sometimes appear different in different light conditions.

I think the ring is a lovely balance between being a little bit different yet still a classic and timeless design. As you said, the ring doesn’t catch on anything (I even tried it on my tights) so I can wear it without worrying, which is just as important, so it won’t live in a box! I haven’t taken it off and I have had a lot of compliments on it.

So, many thanks for your patience and guidance in helping us identify what we wanted!


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