The 3 inch Heart Mold from Colour de Verre casts a heart-shaped glass piece measuring approximately 3 inches by 3-1/4 inches. Unlike molds with a fixed fill weight, this one lets you vary how much frit you load: use as little as 90 grams for a lightweight, translucent result, or fill up to 290 grams for a thicker, more substantial piece. That range gives you direct control over the final look of each heart, from a thin sun catcher to a solid ornament or gift piece.
As a ceramic casting mold it is COE agnostic: fill the cavity with frit, powder, or small glass billets in any fusible COE and fire to shape. The mold is reusable across many firings when primed and cared for properly before each use.
What does the 3 inch Heart Mold make?
It casts one heart-shaped glass piece per firing, finished at approximately 3 inches by 3-1/4 inches. Depending on fill weight, the result can range from a thin, translucent sun catcher to a thicker ornament.
How much frit do I load into this mold?
Colour de Verre lists a fill range of 90 to 290 grams depending on the thickness you want. There is no fixed fill weight, so you adjust the amount to match your intended result. Weigh your glass and test a first firing before committing to a large run.
What COE glass works with 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.
How do I prep the mold before each firing?
Colour de Verre requires priming before every use. Coat the cavity with a boron nitride primer and let it dry completely before adding glass so the finished piece releases cleanly.
Specifications
- SKU: 181660
- Manufacturer: Colour de Verre
- Makes: 1 heart per firing
- Finished piece size: approximately 3 inches x 3-1/4 inches
- Fill weight: 90 to 290 grams (varies with desired thickness)
- 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 test a small run first when the result matters and follow a casting schedule suited to your glass and kiln.
- Colour de Verre requires priming before every use. Coat the cavity with ZYP Boron Nitride Mold Primer or Hotline Primo Primer and let it dry fully before adding glass.
- Fill weight ranges from 90 to 290 grams. A lighter fill produces a thinner, more translucent piece; a heavier fill produces a thicker, more opaque result. Weigh your glass and run a test firing first.
- The mold is COE agnostic. Use a full fuse schedule matched to your glass, and adjust the anneal soak for your COE: about 950 F for COE96, or about 900 F for COE90.
- Let the kiln cool fully before removing the cast piece. Re-prime the mold before each subsequent firing.
Colour de Verre Suggested Firing Guidelines
This is a suggested starting point, not a guarantee. Every kiln fires differently. Follow the Colour de Verre project sheet for this mold and test a small run first before relying on any schedule.
- Heat no faster than about 350 F (195 C) per hour during the climb to firing temperature.
- Fire to no more than about 1450 F (785 C) at peak.
- Add a controlled cool with an anneal soak matched to your glass: about 950 F for COE96, or about 900 F for COE90.
Helpful downloads: Priming Molds With ZYP Spray (PDF)
Description updated: July 6, 2026
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