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 19th April

Opening hours during the summer months are Tuesday to Saturday 10am to 5pm. We are open outside these hours by arrangement.

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Upcoming Events

Friday 28th March ~ 12:00pm

2025 Gem Talks - second quarter talks will be in Minchinhampton, Quedgeley, Childswickham, Winstone, Tewkesbury, Woolaston, Cheltenham, Willersley, Upton St Leonards, Bentley, Wyre Piddle, Hucclecote, Littleton and Cirencester. 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…

Mrs B writes…

I have had lots of members comment on what a super talk you gave us, so interesting and informative, we would love for you to come back again and talk about opals.

Many of us are planning visiting your shop during the summer.

Mrs G writes…

Dear Helen,

Thank you so much for bringing your passion, knowledge, and humour to Edge WI last night.

Although we are only a small WI and further depleted by Covid and caring duties, we really appreciated the breadth of information you gave us about opals. I think you covered just about every subject in the curriculum.

The specimens that you brought were magnificent. The experience of being able to compare and contrast the different ones was a rare privilege. It’s just as well we are all honest women, or I think some may have ‘walked’ home with various members.

And a big thank you to your charming son, who was riding’shotgun’. I’m sure he had much better things to do on a Thursday night!


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