Holey Rhombus Kiln Casting Mold

The Holey Rhombus mold from Creative Paradise casts one diamond-shaped piece with a hole built directly into the casting, finished at 2.25 inches long by 2 inches wide. The mold footprint is 3 inches by 2.75 inches, so it fits alongside other molds in smaller kilns without taking up much shelf space. Because the hole is part of the cast shape, the finished piece can be strung on a cord, wire, or jump ring as a pendant without any post-firing drilling.

Fill the cavity with about 26 grams of frit, small billets, or stacked sheet scrap and fire to a full fuse. Like all ceramic casting molds, this one is COE agnostic and reusable across many firings when primed and cared for properly.

What does the Holey Rhombus mold make?
It casts one rhombus-shaped piece measuring 2.25 inches by 2 inches, with a hole cast into the piece. The finished casting is ready to hang as a pendant or earring without drilling.

What is the hole in the finished piece for?
The hole is formed during casting, so the finished rhombus can be strung or wire-wrapped directly. There is no need to drill after firing, which keeps the piece intact and saves a step in jewelry production.

What COE 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.

How much glass do I need?
Creative Paradise lists about 26 grams per cavity. Weigh your glass and test a first run when the result matters, as fill weight can vary with how you pack the cavity.

How do I prep the mold before casting?
Coat the cavity with a kiln shelf primer such as a boron nitride spray (for example ZYP) or a kiln wash such as Hotline Primo Primer, and let it dry completely before adding glass. Re coat as needed between firings.

Specifications

• SKU: 162876
• Manufacturer: Creative Paradise (CPI.LF59)
• Makes: 1 rhombus with built-in hole
• Finished piece size: 2.25 inches L x 2 inches W
• Mold size: 3 inches L x 2.75 inches W
• Suggested fill weight: about 26 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 test a small run first when the result matters and follow a casting schedule suited to your glass and kiln.

• Prime the cavity with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash, and let it dry completely before adding glass so the glass does not stick.
• Fill with frit, small billets, or stacked sheet scrap. For a tack fired surface, the manufacturer suggests powder and fine frit filled uniformly to about a quarter inch.
• The mold is COE agnostic. Use a full fuse schedule matched to your glass, adjusting the final anneal soak for your COE.
• Let the kiln cool fully before removing the cast piece. Re coat the mold with primer as needed between firings.
• The Slide Hi Temp brand separator is not recommended with these molds.

Creative Paradise Suggested Firing Schedule

This is a suggested COE96 starting schedule, not a guarantee. Every kiln fires differently. Test a small run and adjust the schedule for your glass and kiln.

Full Fuse (COE96):

Tack Fire (COE96): for a tack fired surface, fill uniformly to about a quarter inch with powder and fine frit.

*Segment 4 is the anneal soak at 950 F for COE96. If using COE90, adjust this temperature to 900 F.

Helpful downloads: Holey Mold Tutorial (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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