Just Gems sells high-quality, certified diamonds & coloured gemstones, set in fine jewellery. We also offer a selection of rare & unusual natural gemstones which appeal to a discerning clientele.

Just Gems is owned and run by Helen Plumb, a gemmologist of international reputation, who is keen to share her knowledge & enthusiasm for gemmology with those interested in learning more at events. Just Gems was based in Aberdeen, Scotland but has now relocated to Winchcombe, in the Cotswolds.

Spectacular Boulder Opal

Just Gems sells high-quality, certified diamonds & coloured gemstones, set in fine jewellery. We also offer a selection of rare & unusual natural gemstones which appeal to a discerning clientele.

Just Gems is owned and run by Helen Plumb, a gemmologist of international reputation, who is keen to share her knowledge & enthusiasm for gemmology with those interested in learning more at events. Just Gems was based in Aberdeen, Scotland but has now relocated to Winchcombe, in the Cotswolds.

Boulder Opal Stud Earrings in Yellow Gold

Kunzite & Ethiopian Opal Pendant

8.78ct pear cut kunzite, set with 1.42ct pear cut cabochon Ethiopian opal, in 18ct white gold, suspended from 16” 18ct white gold anaconda chain

Paraiba Tourmaline & Diamond Ring in Platinum

4.02ct Oval cut Paraiba type, cuprian elbaite tourmaline set with 0.51ct E colour VS clarity diamonds in platinum

Our Latest News

Friday 26th October

We will be purchasing new stock for Christmas!

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Upcoming Events

Wednesday 19th September ~ 11:35am

Helen Plumb will be giving a talk on Coloured Gemstones to Stow Civic Society at a lunch on Monday 11th November at 12.15pm. The talk will be held at Wick Hill House, Cheltenham GL54 1HY.
Please contact Rachel Surman on 07904 004501 for more information.

See further details

Featured Jewellery

Shamrock pendant in rose goldBoulder opal, orange & green garnet earrings in 18ct yellow goldEthiopian opal ring in 18ct goldWatermelon tourmaline & sapphire pendant in rose & white goldRound emerald pendantWatermelon tourmaline cabochon cufflinks in silverYellow diamond 5 stone cluster ring in 18ct yellow goldRuby & pearl pendant in goldKunzite & opal pendantRubellite & golden diamond ring in goldAmethyst & sapphire pendant in rose & white goldTanzanite & sapphire pendant in 18ct white goldBlack opal and pink sapphire heart ring in platinumGolden pear cut diamond ringKildrummy quartz, brown diamond and pink sapphire pendant in 18ct rose and white goldPink 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.

See Opening Times and Directions

From our customers…

Mrs K writes…

Dear Helen
I have just returned home after a splendid weekend in Edinburgh celebrating my birthday with my son and his fiancée. On Saturday evening we dined at Prestonfield House. The candlelight was just the perfect medium to show off your superlative pendant which I absolutely love. It was presented to me whilst sharing a champagne toast before we went into dinner, so I had to wait until I could skip out to the powder room to admire it. Thank you so much. It really is quite stunning.

Miss K writes…

My partner and I commissioned an engagement ring from Helen Plumb (Just Gems), after viewing the stunning jewellery on her website. We live in Australia and were initially a little sceptical about making such an important purchase without meeting our jeweller or being able to view the piece in person. Right from our first email correspondence with Helen, we knew we were in good hands. Helen’s knowledge of precious stones and absolute professionalism made our experience a very easy and enjoyable one. I especially liked that Helen showed genuine enthusiasm for this assignment. We were constantly kept informed of the progress of the ring and Helen was happy to answer any questions I had along the way. Shipping of the ring was also well organised and fast. We now have the ring and it is everything we’d hoped it would be. I would not hesitate to recommend Helen to anyone who is looking for a personalised, handcrafted piece of jewellery of the highest quality.


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