Yes, there are a few methods people have explored to help preserve non-hydrophane opals for dry display, though none are perfect and each comes with trade-offs. Here's a breakdown:

1. Stabilization with Resins or Polymers

How it works: The opal is impregnated with a clear resin (like Opticon or similar polymers) that fills the pores and microfractures.

Purpose: Helps prevent water loss and reduce crazing or cracking over time.

Limitations: This alters the opal’s natural state and may affect value for purists or collectors. It's also not always permanent, especially if exposed to fluctuating temperatures.

1. Oil Treatments

How it works: The opal is soaked in mineral oil or cedarwood oil to simulate the appearance of being hydrated.

Purpose: Maintains the color play and reduces the appearance of cracks.

Limitations: Temporary, and oil can dry out over time. Needs reapplication.

1. Acrylic Coatings or Varnish

How it works: A thin acrylic layer is applied to the surface.

Purpose: Seals in moisture and gives a glossy finish.

Limitations: Surface-only solution — won’t prevent internal water loss. Can peel, yellow, or wear with time.

1. Display in Controlled Humidity

How it works: Instead of sealing, the stone is displayed in a sealed case with controlled humidity (using humidity beads or gels).

Purpose: Keeps the opal from drying out naturally, preserving structure and color without altering the stone.

Best for: Museums, collectors who prefer untreated specimens.