18mm Heart Cabochon Duo

(12 customer reviews)

US$15.00 ex. Vat

Handmade silicone mould with two depressions for 18mm flatback medium heart cabochons. Ideal for making necklace cabochons with resin, polymer clay or concrete. You can include your clients’ elements or inclusions such as breastmilk, lock of hair, umbilical cord and placenta or cremation ashes. Compatible with our 18mm heart setting here (click)

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18mm medium heart cabochon mould/mold pairs (two depressions in each mould to fill). Please read our full Terms and Conditions and FAQ page before ordering.

Setting an 18mm Heart Cabochon

They are perfect for use with Compatible with our 18mm heart setting here (click)! And you can include a silver necklace chain for your customer. This will give you everything you need for a beautiful 18mm heart necklace for your clients.

lock of hair heart necklace with a forget me not and genuine opal slices (secret VIP extra). New scalloped edge setting
lock of hair heart necklace with a forget me not and genuine opal slices. New scalloped edge setting

You can watch this video below for inspiration and here is the full blog on making a cremation ashes heart necklace

Rainbow Breastmilk Heart Tutorial Video

Alternatively you can wire wrap your heart using this tutorial for inspiration

[youtube https://www.youtube.com/watch?v=lHQ4AxtvRc8&w=560&h=315]

Using Silicone Moulds

Because they are made from water-clear silicone, our moulds (molds) they are ideal for all types of resin including UV curing resin. No need for polishing or sanding. We use a strong but flexible high quality silicone and each mould is hand made and checked.

Simply mix your resin with colours, sparkles, flowers or your clients’ elements or inclusions like breastmilk, lock of hair, umbilical cord and placenta or cremation ashes. Then add to the mould and cure in the usual way. Or you can add your resin to the mould before adding elements.

If working with UV resin we recommend you work in layers to achieve beautiful depths of colour.

These moulds are suitable for use with resin (UV resin, EcoResin, epoxy resin or polyester resin), concrete, polymer clay (air drying, heat curing such as Premo and Sculpey). We recommend removing the polymer clay from the mould before baking if not using air drying clay although they can be heated up to 130°C. Although we use a food-safe silicone, we don’t recommend these moulds for use with food due to the manufacturing process.

Mould Life and Care

These moulds are sold for semi-permanent use and will degrade with use. This is normal and not classed as a fault. Please see our mould care information for more info. The life of your moulds will depend on the material used, the number of uses, how gentle you are using it, good storage, careful washing and environmental factors.

Test Cast

It is very important you do a test cast with each mould to check for imperfections, to remove any dust attained during transit and to make sure you are comfortable using the mould before making any jewellery. We advise you use UV resin for this and coat the depression in resin before curing, removing and making a visual check. If there is a problem with the test cast please get in touch within 7 days of receipt.

Settings and Findings

We recommend that medium heart resin cabochons are fitted into place with a crown point setting or serrated bezel but you can also glue them onto shallow bezel cups or glue on a bail (necklace setting). Due to differences in manufacturing processes, we cannot guarantee a perfect fit with any specific setting, many heart settings are different shapes. If you are unsure please order a single mould to test, make a test cast cabochon (see above) then test it in the setting. To help you remove it from the bezel cup, place a length of dental floss over the bezel cup first before pushing in the cabochon.

Contact Us

If you have any questions please email us on keepsakersupplies@gmail.com or get in touch on our Facebook page Keepsaker Supplies (click here).

This page contains affiliate links meaning we may receive a small amount of commission based on your purchases with no extra cost to yourself.

Additional information

silicone type

water clear

cab size

18mm heart




normal, seconds

12 reviews for 18mm Heart Cabochon Duo

  1. madcatsalert (verified owner)

    This is a fantastic mold, super quality , crystal clear and very easy to use and the results are stunning. The cast piece i cast from it looks like glass so pleased with it i ordered more different types of molds. I would recommend this if you are wishing to cast perfect hearts.

  2. eleesha1992 (verified owner)

    Comes out perfect

  3. zenjakiss96 (verified owner)

    I get my Mold and cabochon yesterday and already made fantastic jewellery. I’m definitely will order again soon. Top quality products. Thank you so much

  4. m.cyphers (verified owner)

    I get the majority of my molds from Nikki, they’re without a doubt the best quality and the water clear property means they are perfect for UV resin projects too. I use these for necklaces, brooches and other creative memorial pieces and they come out perfect every time. I’ve used them multiple times and still have lots of life left in them

  5. ludanchirnside (verified owner)

    Really good quality and makes a lovely resin piece. Fits perfectly with the heart setting too.

  6. frannyp (verified owner)

    Great quality mould – I use with the 18mm heart crown setting.

  7. bespokememorial.uk (verified owner)

    Lovely moulds, leaves the finished cabochon with a really shiny finish. Sits nicely into the 18mm heart pendant.

  8. mrscatherinereed (verified owner)

    Great quality mould and fit perfectly with the heart pendant setting.left beautiful shiny finish on m breastmilk jewel

  9. nacollereynolds (verified owner)

    Great quality mold!

  10. llinola (verified owner)

    Great quality mould as always with Nikki. Fits my setting perfect. Thank you

  11. Tracie Nall (verified owner)

    Fits my setting perfectly!
    Thank you very much

  12. Tracie Nall (verified owner)

    I have purchased another mould duo, the finish on my pieces are perfect! wouldn’t go anywhere else for my moulds.

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