The Heart Box Mold from Colour de Verre is a two-part ceramic casting mold set that produces both the base and lid of a heart-shaped glass box. Load each cavity with frit in any mesh size, billets, casting rocks, nuggets, pebbles, sheet glass, or nipped rods to build a fully custom piece. The finished box works well as a decorative keepsake, a jewelry box, or a functional art piece.
The base mold measures 5.75 inches by 5.75 inches by 2.25 inches. Colour de Verre lists a fill weight of about 310 grams for the base cavity and about 130 grams for the lid cavity. Like all ceramic casting molds, this set is COE agnostic and reusable across many firings when cared for properly.
After the initial casting firings, a second decorating step is possible: tack fuse Colour de Verre castings such as blossoms, leaves, butterflies, or dragonflies to the surface to personalize the finished box.
What does the Heart Box Mold make?
It casts the base and lid of a heart-shaped glass box as two separate pieces. Colour de Verre lists a fill weight of about 310 grams for the base cavity and about 130 grams for the lid cavity.
What glass can I use in this mold?
Any COE. Ceramic casting molds are COE agnostic, so the same mold works with COE96, COE90, or other fusible glass. Match your firing schedule to the glass you are using.
What materials can I fill the cavities with?
Colour de Verre lists frit in any mesh size, billets, casting rocks, nuggets, pebbles, sheet glass, or nipped rods. Mixing fill types lets you vary the color and texture of each finished piece.
How do I prep the mold before casting?
Prime the cavities with ZYP BN Lubricoat or Hotline Primo Primer before every use and let the primer dry completely before adding glass. Re-prime as needed between firings.
Specifications
- SKU: 181656
- Manufacturer: Colour de Verre
- Makes: glass box base and lid (two-part mold set)
- Base mold size: 5.75 inches L x 5.75 inches W x 2.25 inches H
- Base fill weight: about 310 grams
- Lid fill weight: about 130 grams
- Material: ceramic kiln casting mold, reusable
- Glass: any COE (COE agnostic)
Working Notes
These are guidelines, not guarantees. Every kiln fires a little differently, so follow the Colour de Verre project sheet for this mold and test a small run first when the result matters.
- Prime the cavities with ZYP Boron Nitride Mold Primer or Hotline Primo Primer before every use and let the primer dry fully before adding glass so the cast pieces release cleanly.
- Fill the base cavity with about 310 grams of glass and the lid cavity with about 130 grams. Use frit in any mesh size, billets, casting rocks, nuggets, pebbles, sheet glass, or nipped rods.
- The mold is COE agnostic. Use a firing schedule matched to your glass type and COE.
- Let the kiln cool fully before removing the cast pieces. Re-prime the mold before each subsequent firing.
- After casting, personalize the box in a second firing by tack fusing Colour de Verre castings such as blossoms, leaves, butterflies, or dragonflies to the surface of the finished pieces.
Colour de Verre Suggested Firing Schedule
This is a suggested starting schedule based on Colour de Verre general guidance, not a guarantee. Every kiln fires differently. Follow the Colour de Verre project sheet for this mold and test a small run first.
- Heat no faster than about 350 F (195 C) per hour.
- Fire to no more than about 1450 F (785 C).
- Add a controlled cool with an anneal soak matched to the glass you are using; consult your glass manufacturer for the correct anneal temperature.
Helpful downloads: Priming Molds With ZYP Spray (PDF)
Description updated: July 6, 2026
Spot an error or have feedback on this description? Report it here.
