DIY A Lookalike Agate Slice Necklace With Epoxy

how to make agate slice necklace with resin
Ready to take on a new resin project? You may have seen resin agate slice coasters, but did you know you can also use resin to make an agate slice necklace? You’ll have people thinking your necklace is the real thing.

Resin Supply list:

Clear doming resin
Resin pigments
Two-part Silicone Paste
DecoArt Metallic Lustre: Gold Rush
Digital scale
Disposable plastic piping bag
1-ounce graduated plastic measuring cups
Teflon craft sheet
BBQ torch or gas lighter
Wooden stir sticks
Tonic Studios scissors
Emery board: medium
Disposable gloves

To assemble the necklace:

13 gold eye pins
Gold reconstituted coral sticks
10 x 3mm gold spacer beads
14” medium-sized gold chain
4 x 4mm gold jump rings
Gold hitch and bail clasp
5-minute epoxy adhesive
Drill and 1mm drill bit
Permanent marker
Pliers: chain nose, flat nose, round nose and flush cutters

Step 1:  Prepare a piping bag


snip piping bag
Cut approximately ¼” from the tip of the piping bag at an angle.

Step 2:  Measure and mix silicone paste

weighing silicone paste
Measure out equal quantities of Parts A and B of silicone paste by weight. I’ve used approximately 0.7oz in total.

mix silicone paste
Mix the paste until no streaks remain, and there is no unmixed silicone on the walls and bottom of the cup.

Step 3:  Form irregular shapes with the silicone

putting silicone paste into a piping bag
Fold the piping bag back onto itself so that the top half is inside out, and then scoop the silicone paste into the tip of the bag. Twist the bag tightly to force the silicone paste into the tip.

pipe agate outlines
Pipe at least four uneven oval shapes onto the craft sheet. Don’t worry about your agate slice necklace pieces being even. Agates in nature aren’t even either.

The internal diameters should range from ¾” to 1-1/4” wide by approximately 1-1/8” high.

rough up outlines
Use the tip of the piping bag to push the silicone into contact with the craft sheet. If there are any gaps, the resin will seep through. This will also help remove the roundness of the piping, giving the agate slices a more realistic appearance.

dry outlines
You can speed up drying of the silicone paste by applying heat to each outline with the heat gun. If you don’t have a heat gun, place the piping bag into the refrigerator whilst the shapes are drying. The cold will slow down the curing of the silicone.

Step 4:  Add a second layer of silicone

adding a second layer of silicone
Once the first layer of silicone paste is solid, pipe a second layer on top, following the outline of the first layer. Apply heat to dry this layer.

Step 5:  Add a third layer of silicone

silicone forms for agate slices
Pipe a third layer. Ensure the top edge is the same height around each agate outline and that there are no gaps between the layers where resin could seep out.

Step 6:  Measure and mix the resin

Measure 1 ounce total of your epoxy resin.

mixing resin
Mix the two parts together thoroughly for two minutes, scraping the walls and bottom of the cup. Then, transfer the resin to a second cup and mix for a further minute.

Step 7:  Color some of the resin

coloring resin
Divide two-thirds of the resin between three small cups. Color two to look like the color of greens you can find in nature. Color the third cup with white pigment.

Here are some ideas for combining colors to get different shades of green for your agate slice necklace.

green resin
Pour the darker green resin into the bottom of one of the agate molds.

white resin
Next, add white resin to the center.

adding more green resin
Then, pour lighter green resin into the center of the white resin.

adding clear resin
Finish by pouring clear resin into the center.

layering colors
Continue pouring the colored resins alternately into the center of the mold until each mold is filled.

Step 8:  Remove bubbles

pop bubbles
Pop resin bubbles by passing the flame across the surface briefly. Keep the flame moving at all times. Repeat after 15 minutes, then leave the resin to dry for 24 hours.

Step 9:  Demold

demold agate pieces
Peel the agates away from the craft sheet and remove the silicone outlines from the resin.

Step 10:  Finish edges

trim resin edges
Use scissors to trim rough, sharp edges and to shape where necessary. Don’t go crazy here! You want your agate slice necklace to look natural. Agates don’t have even edges.

sanding resin edges
Sand uneven spots with an emery board. Take care not to scratch the surface of the resin agates. Learn more about how to sand resin smooth.

Step 11:  Paint the edges

painting resin edges
Apply Metallic Lustre to the side of each agate with a stiff-bristled paintbrush. The brush will help you push the color into all the crevices. If any gets on the front or back of the agates, scrape it away with your fingernail.

Step 12:  String the necklace

string coral
String a spacer bead, a coral bead, and another spacer bead on an eye pin. Bend the wire at a 90° angle.

trim eyepin
Trim the eye pin to 3/8” with the flush cutters.

turn loop
Use the round nose pliers to turn a simple loop. Make five of these components.

mark drill holes
Arrange four agate slices in a row and place a coral component on each side of the faux agates. Decide where you need to drill on each piece and place a mark with the permanent marker.

drilling resin
Trim eight eye pins to 3/8”. Drill approximately 3/8” into each drill hole. Check that the eye pins fit all the way into the holes.  If this is new to you, this is how you drill holes in resin.

apply adhesive
Mix up a small amount of 5-minute epoxy and apply it to an eye pin.

insert eyepin
Insert the eye pin into the hole. Wiggle it around so that the adhesive coats the inside of the hole. Repeat with each eye pin. You will need to mix up more than one batch. Leave all the pieces to set for an hour before assembling the necklace.

connect resin agate slice necklace charms
Open the eye pin loop of a coral component and hook it through the loop of an agate slice. Close the eye pin securely. Continue adding pieces alternately, finishing with a coral component.

attach chain
Cut the chain in half. Open a jump ring and connect one end of the chain to the end coral component. Repeat with the second piece of chain on the other side of the necklace. Connect the clasp to the two free ends of the chains with jump rings.

Ta-da!  You just learned how to make an agate slice necklace with epoxy!

epoxy resin agate slice necklace

It makes such a pretty statement piece.  And it looks completely natural.

resin agate slice necklace on model


Dreaming of making stylish resin jewelry but don’t know where to start?

It’s why I wrote the book Resin Jewelry Making.  I give aspiring jewelry makers the details they need to make resin jewelry that will have people saying, ‘Wow, how can I get one of those?’ Buy the ebook now, and it will arrive in your email inbox in minutes!


Originally written by Mylene Hillam, Mill Lane Studio

Unpublished Blog Posts of Resin Obsession, LLC © 2022 Resin Obsession, LLC

Like this post? You may be interested in  How To Resin Flowers Like A Boss

6 thoughts on “DIY A Lookalike Agate Slice Necklace With Epoxy

  1. This is such a great idea and I can’t wait to try. It also unleashed about 20 more ideas in using silicon to create one-of-a-kind natural shapes! Your instruction and products are my favorite 🙂

Leave a Reply

Your email address will not be published. Required fields are marked *


Wanna hang out? Cool. We love creative people.

Subscribe to blog updates10.2k
Follow on Facebook22.5k
Follow on Pinterest187.9k
Follow on Instagram15.7k
Follow on Youtube73.1k
Subscribe to forum updates