Reddit reviews 3 Gallon Vacuum Chamber and 3 CFM Pump Kit for Degassing Silicone Epoxy - Not for Wood Stabilizing
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Stainless steel chamber with welded handles for long-term air-tightness performance.Round edge at the top for the protection of silicone gasket.Gauge reading in both inHg and Mpa.All kits are vacuum tested for 24 hours before packaging. (leakage less than 2.0 inHg @ 24 hours)Two-sided flippable vacuum gasket for better durability and reliability.
It will likely all need stabilization; not much is pulled up anymore that's gem-quality hardness. The hardness relates to the dryness of the mineral; the stuff closest to the surface with the most exposure to air will, over millennia dry and become hard. But that's the easy stuff to mine, so there's not much left.
You can stabilize yourself; it's not difficult but does require a small vacuum system like this, along with a stabilizing agent like Opticon. Depending on the rough, you'd likely stabilize twice - the first time for cutting slabs, and then each cut slab as well. I use a 5-gallon vacuum chamber and can easily get a dozen slabs in it.