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 of and enthusiasm for gemmology with visitors to her shop, or at speaking engagements and events.

Large Sapphire & Diamond Ring

11.47ct cushion cut Sri Lankan sapphire set with 1.13ct triangular diamond pair, diamonds G colour VS1 & SI1 clarity, in 18ct white gold. POA

Ruby & Diamond Ring

3.03ct ruby from Mozambique (independently certified to be unheated) set with a 1.00ct pair of heart cut diamonds (GIA certified D & E colour SI1 clarity), in 18ct rose gold and platinum. POA

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 of and enthusiasm for gemmology with visitors to her shop, or at speaking engagements and events.

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 of and enthusiasm for gemmology with visitors to her shop, or at speaking engagements and events.

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

Wednesday 17th August

The Just Gems team has been in Africa July 29th to August 15th soucing exciting new stones from mining locations in Tanzania & Kenya and we are now back at work with sales hours as normal.

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Upcoming Events

Thursday 28th July ~ 12:00pm

August & September talks will be in Malvern, Minety, Tewkesbury, Henley-on-Thames, Church Lawford & Kings Newnham

We are taking bookings for 2023-24, 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 ur latest talks on the About/Testimonials page of our website.

See further details

Featured Jewellery

Oval black opal & tsavorite garnet ringRed spinel & diamond ringAmethyst & sapphire pendant in rose & white goldTanzanite & sapphire pendant in 18ct white goldFancy grey diamond three stone ring in platinumAustralian crystal shell opal set in 18ct yellow gold 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.

See Opening Times and Directions

From our customers…

Mrs M writes…

Thoroughly enjoyed a very informative evening.

Mrs N writes…

Just wanted to say a big thank you for the ring it looks amazing! Can’t wait to show it off, thank you for all your work.


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