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Looking for something uniquely personal?

Collaborate one-on-one with our designers to craft bespoke variations, tailored sizes, or entirely custom commissions.

Mark Kostiak

I live and work on the Isle of Anglesey. In my studio I design and make silver jewellery set with unusual and rare precious stones, with each piece being unique.The uniqueness of each unusual gem, from Herkimer diamonds to aquamarine, is celebrated and expertly hand set. Due to items being handmade delivery can take 1 to 6 weeks

 

Mark Kostiak’s inspired new jewellery collection reflects the beauty and organic tendencies of nature through his hammered textures and the unrefined radiance of the natural, hand cut stones.

Our Terms and Conditions:



OUR JEWELLERY. Each stone we use is unique and a one off, so every item with a set gemstone will be different to the next. Sizes are approximate for the gemstones as they all vary in shape and size.



EXEMPTIONS.



Earrings are not included in our refund policy due to hygiene reason.



Any alterations, bespoke or made to order pieces from Markkostiak.com are not refundable.



MarkKostiak.com does not accept responsibilty for any postage costs incurred or any items stolen, lost,or damaged in transit.



We recommend that you return items using Royal Mail special deliverey as this is insured and tracked.



Postage is not refunded. Your refund will be issued before 14 days to the payment method used in the original purchase.



If you receive a damaged or open package do not accept the delivery, contact us immediatly and we will arrange a replacement to be sent.



ORDER CANCELLATION.



If you wish to cancel your order from markkostiak.com please return the confirmation email stating your intent to cancel. If the order has already been dispatched - please return it for a full refund.



We reserve the right to change, alter, and remove products without prior warning.


Please contact designer.


OUR REFUND POLICY.



If for any reason you are not happy with your purchase from Markkostiak.com we will refund you for up to 14 days from receipt of the goods.



The item(s) must be returned within 14 days of you receiving it.



Our goods must be undamaged, unworn and in the original packaging.



You must also include the order details for this purchase.


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Opening Hours

Sunday 
00:00-23:59
Monday 
00:00-23:59
Tuesday 
00:00-23:59
Wednesday 
00:00-23:59
Thursday 
00:00-23:59
Friday 
00:00-23:59
Saturday 
00:00-23:59

Today's Opening Hours
0:00-24:00 

Shop Open

Direct Connection — Odissa
Odissa

Direct Connection

You're buying from a dedicated master craftsman, not an automated warehouse.


Odissa is an exclusive sister platform of The Guild of Jewellery Designers. When you buy here, you aren't scrolling through imported mass listings. You are connecting straight to independent studio benches across the UK, securing lifetime heirlooms directly from the designers themselves.

Read our origin story →

The Shift in Global Marketplaces

What's been quietly lost in the rush to scale.

Loss of Originality

Large online marketplaces have shifted toward mass-produced, generic, factory-line products, making it difficult to find unique, handmade items.

Quality Concerns

Relaxed verification standards on major platforms have led to issues with material integrity, such as fake silver, cheap base metals, and chipping platings.

A jeweller at the bench, shaping a piece by hand

The Odissa Solution

A dedicated UK home for true British craftsmanship.

Odissa is a dedicated UK marketplace created by The Guild of Jewellery Designers to connect you directly with the hands that shape your story. Every piece is an intimate collaboration, featuring only verified, independent, small-scale designers who specialise in original, handcrafted work. Whether you are looking for a completely bespoke commission or a deeply personal, made-to-order treasure, Odissa champions the beauty of true British craftsmanship tailored uniquely to you.


Key Benefits of Shopping on Odissa

Four promises we hold every maker to.

  • 01

    Guaranteed Material Integrity

    Sellers are members of professional bodies (like The Guild of Jewellery Designers or The British Pearl Association), ensuring authentic, high-quality precious metals and genuine gemstones.

  • 02

    True Originality

    Jewellery is shaped by hand rather than factory molds, resulting in unique pieces with individual character.

  • 03

    Direct Connection

    Customers buy directly from independent British workshops. They can communicate with designers or use the "Commission a Designer" feature for bespoke pieces.

  • 04

    Supporting the Creative Economy

    Unlike giant platforms that take large corporate cuts, Odissa charges minimal fees, ensuring financial support goes directly to the independent makers keeping the heritage craft alive.

Odissa · Independent British Jewellery
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