I've spent more than thirty years in the world of jewellery, from my college and university days onward, and more than twenty-eight of them running my own business. In that time I've created over twenty-five collections, along with several limited editions and countless one-off and commissioned pieces.

I don't design to trends. I'd rather make jewellery with stories and meaning, pieces with a timeless beauty, made to be worn now and to become heirlooms, treasured for generations to come.

You can see all my current collections here, and if you're ever able, I'd love you to visit us in our gorgeous gallery in Llandeilo, south-west Wales, where you can see the collections in their full beauty and try pieces on to see how they feel.

Mari Thomas Collections

306 products

Contemporary Welsh gold jewellery designed and made in Wales and inspired by the Welsh landscape. The necklace is handcrafted in 18ct yellow gold
Mari Thomas Jewellery *New* Carved fine: 18ct gold pendant
£2,400.00
£2,400.00
Contemporary Welsh gold jewellery designed and made in Wales and inspired by the Welsh landscape. This ring suitable for men or women is handcrafted in solid 18ct yellow gold
Mari Thomas Jewellery *New* Carved Fine: 18ct gold ring
from £1,490.00
from £1,490.00
SOLD OUT
One of a kind Bubbles necklace, sterling silver and diamonds — clustered circles inspired by rising champagne bubbles — Mwclis Arian
Mari Thomas Jewellery One of a Kind: (No 1.) Bespoke Silver and Diamond Bubbles Necklace
£995.00
£995.00
Mixed Cultured River Pearl Necklace With 9ct Gold Ball Clasp - Mari Thomas Jewellery
Mari Thomas Jewellery One-of-a-kind: Mixed cultured river pearl necklace with 9ct gold ball clasp
£345.00
£345.00
Pale Pink Cultured River Pearl Necklace With Silver Sparkle Clasp - Mari Thomas Jewellery
Mari Thomas Jewellery Pink cultured river pearl necklace with silver sparkle clasp
£220.00
£220.00
Peach Pink Cultured River Pearl Necklace - Mari Thomas Jewellery
Mari Thomas Jewellery One-of-a-kind: Peach pink cultured river pearl necklace with 14ct gold clasp
£185.00
£185.00
Contemporary Welsh gold jewellery designed and made in Wales and inspired by the Welsh landscape. The stud earrings are handcrafted in solid 18ct yellow gold
Mari Thomas Jewellery *New* Carved Fine: 18ct gold rectangle earrings
£1,340.00
£1,340.00
Contemporary Welsh gold jewellery designed and made in Wales and inspired by the Welsh landscape handcrafted stud earrings in solid 18ct yellow gold
Mari Thomas Jewellery *New* Carved Fine: 18ct gold square earrings
£1,130.00
£1,130.00
Contemporary Welsh silver jewellery. Inspired by Welsh slate and coal and the beautiful landscape of Wales. This solid black oxidised bangle is designed and handmade in Wales UK
Mari Thomas Jewellery Carved: Wide Black Silver Bangle
£695.00
£695.00
Mari Thomas Jewellery Carved: Rectangular Black Silver Lapel / Tie pin
£89.00
£89.00
Cube: Black Silver Ring - Mari Thomas Jewellery
Mari Thomas Jewellery Cube: Black Silver Ring
£110.00
£110.00
Cube: Black Silver 3 Cube Stacker Bangle - Mari Thomas Jewellery
Mari Thomas Jewellery Cube: Black Silver 3 Cube Stacker Bangle
£450.00
£450.00
Cube: Black Silver 3 Cube Bangle - Mari Thomas Jewellery
Mari Thomas Jewellery Cube: Black Silver 3 Cube Bangle
£300.00
£300.00
Cube: 1 Cube Black SIlver Stacker Bangle - Mari Thomas Jewellery
Mari Thomas Jewellery Cube: Single Cube Black Silver Stacker Bangle
£340.00
£340.00
SOLD OUT
Mari Thomas Jewellery Carved: Rectangular Black Silver Cufflinks
£185.00
£185.00
Cofio lapel pin, silver and 18ct gold plated silver — Waldo Williams's words cast in metal
Mari Thomas Jewellery Cofio / Remember: Gold and silver lapel / tie pin
£150.00
£150.00
Cofio / Remember: Black Silver Cufflinks - Mari Thomas Jewellery
Mari Thomas Jewellery Cofio / Remember: Black Silver Cufflinks
£230.00
£230.00
Cube: Black Silver Drop Pendant - Mari Thomas Jewellery
Mari Thomas Jewellery Cube: Black Silver Drop Pendant
£165.00
£165.00
Cube: Black Silver 3 Drop Pendant - Mari Thomas Jewellery
Mari Thomas Jewellery Cube: Black Silver 3 Drop Pendant
£280.00
£280.00
Mari Thomas Jewellery Carved: Black Silver Square Pendant
£210.00
£210.00
Mari Thomas Jewellery Carved: Black Silver Arc necklace
£580.00
£580.00
Decorative Concepts large statement ring, black oxidised silver — a bold sketchbook line cast in metal — Modrwy Arian
Mari Thomas Jewellery Decorative Concepts: Large Black Silver Statement Ring
from £230.00
from £230.00
Decorative Concepts ring top, black oxidised silver — a bold pencil mark cast in metal — Modrwy Arian
Mari Thomas Jewellery Decorative Concepts: Medium Top Black Silver Ring
£115.00
£115.00
Decorative Concepts statement earrings, black oxidised silver — a bold sketchbook mark — Clustdlysau Arian
Mari Thomas Jewellery Decorative Concepts: Statement Black Silver Earrings
£355.00
£355.00
Decorative Concepts large pendant, black oxidised silver — a bold pen stroke cast in metal — Mwclis Arian
Mari Thomas Jewellery Decorative Concepts: Large Black Silver Pendant
£680.00
£680.00
Decorative Concepts: Medium Black Silver Earrings - Mari Thomas Jewellery
Mari Thomas Jewellery Decorative Concepts: Medium Black Silver Earrings
£68.00
£68.00
Decorative Concepts lapel pin, black oxidised silver — a considered mark drawn from paper
Mari Thomas Jewellery Decorative Concepts: Black Silver Lapel Pin
£95.00
£95.00
Decorative Concepts cufflinks, black oxidised silver — a considered mark drawn from paper — Botymau Coesau Arian
Mari Thomas Jewellery Decorative Concepts: Black Silver Cufflinks
£220.00
£220.00
Decorative Concepts ring top, 18ct rose gold plated silver — a pencil-drawn line cast in metal — Modrwy Arian ac Aur
Mari Thomas Jewellery Decorative Concepts: Rose gold medium top ring
from £230.00
from £230.00
Decorative Concepts large pendant, 18ct rose gold plated silver — covered in Mari's own handwriting at bold scale — Mwclis Arian ac Aur
Mari Thomas Jewellery Decorative Concepts: Rose Gold Large pendant
£890.00
£890.00
Mari Thomas Jewellery One of a kind - Carved arc pendant with moss agate
£595.00
£595.00
Mari Thomas Jewellery Solitaire: Silver Brooch with a Pink Tourmaline
£790.00
£790.00
Mari Thomas Jewellery Solitaire: Silver Brooch with a Peridot
£790.00
£790.00
Limited Edition: Llawenhau (Rejoice) Earrings - Mari Thomas Jewellery
Mari Thomas Jewellery Last chance: Llawenhau (Rejoice) Earrings
£190.00
£190.00
Welsh gold ring inspired by the strata of Welsh slate handcrafted and handmade in 18ct rose red gold
Mari Thomas Jewellery *NEW* Linear Fine: Narrow 18ct Rose Gold Ring
from £870.00
from £870.00
Linear Fine: Long 18ct Gold Earrings - Mari Thomas Jewellery
Mari Thomas Jewellery Linear Fine: Long 18ct Gold Earrings
£1,990.00
£1,990.00
One of a kind Golden Bubbles pendant with diamonds, 18ct gold — clustered circles inspired by rising champagne bubbles — Mwclis Aur
Mari Thomas Jewellery One of a kind: Golden Bubbles pendant set with 1.50ct diamonds
£12,900.00
£12,900.00
Mari Thomas Jewellery Glissando: Silver Bangle
£490.00
£490.00
Bubbles large pendant, sterling silver — clustered circles inspired by rising champagne bubbles — Mwclis Arian
Mari Thomas Jewellery Bubbles: Large Silver Pendant
£520.00
£520.00
Bubbles medium pendant, sterling silver — clustered circles inspired by rising champagne bubbles — Mwclis Arian
Mari Thomas Jewellery Bubbles: Medium Silver Pendant
£395.00
£395.00
Decorative Concepts cufflinks, a considered mark cast in sterling silver — Botymau Coesau Arian
Mari Thomas Jewellery Decorative Concepts: Silver Cufflinks
£220.00
£220.00
Mari Thomas Jewellery Carved: Silver Fractured Earrings
£170.00
£170.00
Contemporary Welsh silver jewellery. Inspired by the beautiful landscape of Wales. This statement necklace is designed and handmade in Wales
Mari Thomas Jewellery Carved: Silver Arc Necklace
£580.00
£580.00
Mari Thomas Jewellery Glissando: Silver Lapel / Tie
£95.00
£95.00
Mari Thomas Jewellery Glissando: Silver Brooch
£320.00
£320.00
Mari Thomas Jewellery Solitaire: 18ct Gold Ring with Emerald
£5,500.00
£5,500.00
Mari Thomas Jewellery Solitaire: 18ct White Gold Ring with Pink Sapphire
£5,800.00
£5,800.00
Mari Thomas Jewellery Solitaire: 18ct White Gold Ring with Tanzanite
£5,800.00
£5,800.00
Mari Thomas Jewellery Solitaire: Black Silver bangle with Diamond
£950.00
£950.00
Mari Thomas Jewellery Carved: Rectangular Silver Lapel / Tie pin
£89.00
£89.00
+44 (0) 1558 660001
Secure checkout
Sustainably and ethically made
5 Star excellent on Trustpilot