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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Featured Jewellery

Sea green tourmaline & diamond ring in white goldCushion cut unheated sapphire & heart cut diamond ring in platinumPink spinel & cushion cut diamond ring in platinumNatural yellow zircon & diamond pendant in platinumBlack opal ring in 18ct yellow goldSpectacular aquamarine briolette & diamond pendant in platinumTsavorite & diamond cluster ringSapphire & diamond cluster ring in 18ct yellow goldWatermelon tourmaline cabochon cufflinks in silverBlack opal and pink sapphire heart ring in platinumPink sapphire & Tahitian pearl pendant in 18ct white gold

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 R writes…

My ring has just this minute been delivered. I am delighted with the purple sapphire you chose. I couldn’t have picked better myself!
Thank you for all your help and interest in replacing my missing gem. I will definitely recommend you to others and I hope to purchase from you in the future.

Professor H writes…

For our 40th Wedding anniversary my husband arranged to add some bling to my wedding and engagement rings. We went to see Helen at ‘Just gems’ and with her help designed additional diamonds into the band and beside the sapphire in my engagement ring. With the expertise of her team the rings were given a new and modern life and are absolutely spectacular and fit for the next 40 years!


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