Silicone molds are BEST for making art stones. They are non-stick so they do not need to be coated with a releasing agent. Just wash them out when you are done making stones and that's it. Simple and easy.
This mold makes 3 medium sized river rocks. They are sized 3-4 inches in length. I really like these as they have a more natural shape. I paint these and the Santorini ones the most!
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You can also use flexible plastic molds or flexible cookie cutters to make art stones, you will just need to make sure the plastic is flexible to be able to remove your art stone from. Also, you will have to use vegetable oil to coat the plastic molds or cookie cutters to be able to remove the art stones.
Here are some of my favorite Molds for making Art Stones!
1. ART STONE MOLDS
NEW BIG DEAL!! Art Rock 5 Molds from Divine Specks
This is an amazing silicone art stone mold! It is now my absolute favorite mold! It makes 5 beautiful perfect round stones in 5 different sizes. They are so smooth and beautifully shapes. Plus, it only takes 2.5 cups of Mortar to make all 5 stones. Or if you want to make only the 4 larger stones, it only takes 2 cups of Mortar. You can purchase this mold on Etsy from Divine Specks!
Stone sizes are:
4.5 inch
4 inch
3 inch
2.5 inch
2 inch
Santorini Rock Mold from Happy Dotting Company
This is one of my favorite molds. It makes 4 large stones and 1 small stone that are all completely flat. They are perfect for painting. You can purchase this mold on Amazon or Etsy from the Happy Dotting Company.
Art Mold From Divine Specks
This makes 5 lovely completely flat art stones in a variety of shapes. Pat from Divine Specks is so kind. She has provided me with excellent customer service over the years. Divine Specks on Etsy is a great small business I enjoy supporting!
3D Medium River Rock Mold
This mold makes 3 medium sized river rocks. They are sized 3-4 inches in length. I really like these as they have a more natural shape. I paint these and the Santorini ones the most!
Small River Rock Mold
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This mold makes 6 small river rocks. They are sized 2 - 3 inches in length. These are perfect for kindness rocks, ladybugs and bees. I really like these as they have a more natural shape.
Amazon Link
Mold #5 makes a HUGE 5.5 inch stone
This set of 2 molds makes 16 round stones that are 2 inches in diameter. I fill them up to 1/2 inch of thickness which is about 1/3 of the way. A 20 ounce batch of mortar mix makes about 14-16 stones at the 1/2 inch thickness. These are great for rock hiding! They are sold on Amazon .
A 55 lb bag of Rapid Set Mortar will make about 29 batches of 20 ounce mortar. Depending on the size of the stone here is about how many stones a 55 lb bag makes:
55 lb bag = 406 - 464 Small Art Stones (14-16 stones per 20 ounce batch)
55 lb bag = 174 - 290 Medium Art Stones (6-10 stones per 20 ounce batch)
55 lb bag = 116 Large Art Stones (4 stones per 20 ounce batch)
Happy Rocking!
Amazon Link
COMBO PURCHASE
If you are interested in both the 3D Medium & Small River Rock molds, you can buy them as set and save money.
Round Art Stone Molds From Happy Dotting Company
These art stone molds makes a beautiful round stone. They come in 4 different sizes. They are excellent for painting and for dot work. You can purchase them on Amazon or Etsy from the Happy Dotting Company. Amazon links below.
2. Silicone Baking Molds
You can find a variety of silicone baking molds at craft and kitchen stores and Amazon. I found these great ones on Amazon that make awesome Art Stones for painting.
Small 2.5 inch Oval Molds
This set of two molds has quickly become one of my favorite little molds! The stones are oval in shape and are 2.5 inches in length by 1.75 inches wide. It makes 16 stones. I fill them up to 1/2 inch of thickness and they make a cute little oval stone. A 20 ounce batch of mortar filled to 1/2 inch thickness makes about 14-16 stones. They are sold on Amazon for about $8.00.
Medium 3.5 inch Oval Stones
I discovered these oval molds at Baker Depot, two molds for only $8.00. You can make up to 12 stones at a time. You can make about 7-8 stones with 20 ounces of mortar filling the mold about 3/4 of the way. If you fill them less they are too thin on the ends and can break. The stones are about 3.5 inches long by about 2.5 inches wide. I really enjoy painting these!
Small 2 inch Round Mold
This set of 2 molds makes 16 round stones that are 2 inches in diameter. I fill them up to 1/2 inch of thickness which is about 1/3 of the way. A 20 ounce batch of mortar mix makes about 14-16 stones at the 1/2 inch thickness. These are great for rock hiding! They are sold on Amazon .
Medium 3 inch Round Mold
This mold makes 12 stones that are 3 inches in diameter. It is a high quality mold. Very strong and sturdy. A 20 ounce batch of mortar will make about 10-12 stones if filled to a 1/2 inch thickness. The mold is a bit pricier than the others. It runs about $20.00 on Amazon.
Heart Shaped Art Stones
I found these silicone heart molds at Baker Depot for only $8.00 for two molds. You can make up to 12 stones at one time. These molds make a great flat heart shaped stone. I fill the mold about half way and they turn out perfect. You can make about 6-7 of these stones with 20 ounces of mortar. These heart stones are about 2.5 inches in width and length at their widest points.
3. Cookie Cutters
You can also use cookie cutters to make fun shaped stones! The metal cutters work the best and preferable 1 inch thick in depth. You want the stones to be at least 1/2 inch in thickness or they will be thin and easy to break. You can use plastic cookie cutters but be sure they are flexible and not too stiff. You will for sure want to use veggie oil on all the cookie cutters as it a bit challenging to get them without it. You will also need a silicone craft or baking mat to make them on. The mat will create a smooth flat surface for your art stones so they can be painted. For info on how to use cookie cutters with the mortar see the post "Using Cookie Cutters To Make Art Stones".HOW MANY ART STONES WILL A BAG OF MORTAR MAKE?
A 55 lb bag of Rapid Set Mortar will make about 29 batches of 20 ounce mortar. Depending on the size of the stone here is about how many stones a 55 lb bag makes:
55 lb bag = 406 - 464 Small Art Stones (14-16 stones per 20 ounce batch)
55 lb bag = 174 - 290 Medium Art Stones (6-10 stones per 20 ounce batch)
55 lb bag = 116 Large Art Stones (4 stones per 20 ounce batch)
Happy Rocking!