There are several ways to measure your finger size.  Please note that when your fingers are cold your ring size will be smaller.  If you are ordering a wider band you may need to go up one size.

1: Visit your local jeweller and they will be able to measure your finger precisely.

*this is the best option as it’s more accurate*

2: If you live local to Falmouth, visit me at an event.

3: Use this guide…

Paper being used to measure ring size in a finger Measuring ring size. Paper used to measure finger against a ruler showing 64mm.

Cut a strip of paper a few mm wide.

Wrap it around the finger, marking with a pencil where it overlaps (you may need an assistant at this point!)

***Make sure that this is able to slide over the knuckle***

(You may wish to tape it closed whilst you test it)

If it fits, flatten out the paper and measure the length accurately.

You can now use this guide to help you calculate your ring size.  Please check this carefully!

Chart showing UK ring sizes

  • Cut a strip of paper a few mm wide or use a piece of tape stuck to itself so that it doesn’t stick to you.
  • Wrap it around the widest part of your hand, marking with a pencil where it overlaps (you may need an assistant at this point!)
  • ***Make sure that this is able to slide over the hand, onto the wrist***

(You may wish to tape it closed whilst you test it)

  • If it fits, flatten out the paper/tape and measure the length accurately.  Send me this length – it will be made a few millimetres wider to allow for ease of fitting.

16", 18" and 20" chain lengths on a model
Porth necklaces come on a choice of chain – 16″, 18″ and 20″ (see image).

The best-seller is 18″; larger seaglass pieces work well on longer chains and so this option has been added to the shop.

If you would like something different, please get in touch so that I can try and meet your requirements.

How will my order be packaged?Necklace, ring and earring boxes displayed on a wooden background. Te boxes are grey, sealed with a turquoise strip and the logo sticker

Porth jewellery comes beautifully packaged.  All rings and necklaces come in a grey card box, sealed with a turquoise strip.

Each piece containing Cornish seaglass also has an insert showing where it was found – perfect for that special gift.

Stud earrings are presented on a turquoise card.  If the item is posted, they will be packaged to keep them safe.

If your order arrives in a padded envelope or containing bubble-wrap, this has been reused where-ever possible.  I aim to recycle – we don’t want any more plastic in our ocean!

How much is postage?

All orders over £50 come with free postage and packaging within the UK

(Royal Mail Second Class Signed For service).

Porth logo showing an envelope in the centre

Orders below £50 within the UK will be charged at £3.95 for Royal Mail Second Class Signed For service.

Porth logo outline of a hand-drawn circle in turquoise with a wave cutting through. In the centre is the image of an aeroplane in grey.

For international deliveries, you will need to contact me.

Please note that items sent outside the UK may be subject to import duties, fees and taxes. The customer is responsible for any additional fees incurred. If you are unsure, we recommend that you contact the appropriate authorities prior to purchase.

Porth logo with collection icon in the centre

Alternatively, if you live locally to Falmouth and would like to arrange to pick up your order, please contact me.

If you would like your order to be posted differently, please contact me.

Come and see Porth Jewellery at an upcoming event…

Mawnan Farmer’s Market


Sunday’s 09.00 – 12.30

Next Market: February 2020


Mawnan Memorial Hall

Sampys Hill

Mawnan Smith


TR11 5EP

Seaglass Sessions logo

Smart Penguin

The Village Square
Mawnan Smith
TR11 5EP

Polliander Studios

99 Acacia Rd
TR11 2JZ

Workshops to create your own seaglass ring or necklace

Booking essential


Carnon Downs Garden Centre 

Sunday 8th December

10am – 4pm

Jubilee Wharf


Saturday 14th December


Sunday 15th December


Working Boat

(Under Greenbank Hotel)


Thursday 19th December



Wearing your silver jewellery is the best way to keep it tarnish-free along with keeping it in an airtight bag when not wearing (adding a silica gel package will help too).  However, you may still want to clean it occasionally.  Talk-town cleaning cloths are a useful addition to your jewellery box and can be purchased easily online and on your local high street.

Avoid wearing your silver jewellery in the sea or pool and avoid spraying perfumes, cosmetics and other household chemicals directly onto it.

Some people choose to rub a small amount of coconut oil onto their seaglass to enhance the colour.

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