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

Sunday 9th February

Opening hours during the winter months are Tuesday to Saturday 10am to 4pm. We will be closed during Cheltenham Festival 11th -14th March inclusive

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Upcoming Events

Wednesday 26th February ~ 12:00pm

2025 Gem Talks - first quarter talks will be in Prestbury, Gorsley & Kilcot, Glyme Valley, Painswick, Moreton in Marsh, Hempsted, Tibberton & Taynton. We are taking bookings for 2026, 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 platinumSpectacular aquamarine briolette & diamond pendant in platinumBlack opal ring in 18ct yellow goldTsavorite & diamond cluster ringSapphire & diamond cluster ring in 18ct yellow goldWood opal pendant in palladium & 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…

Mr M writes…

Once again, thank you so much for making my fiancee’s ring. The process was really enjoyable. Everything from the initial design consultation, choosing the right Gems and metal for the ring to the finished product was done with total professionalism, courtesy and friendliness. My fiancee absolutely loved the ring when I gave it to her, and it fitted perfectly. Many, many thanks. To anyone who is thinking of having some jewellery made, don’t go anywhwere else!

Mrs F writes…

Thanks again for a great evening. The gemology talk was really interesting… if not nearly a little dangerous. My god I loved that opal ring!


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