Encasing the aventurine can help as long as you do not use ANY reduction in your flame as you are applying the clear. The issue here more than likely is too much fuel in your flame. You can deep encase aventurines and greens etc as long as you avoid reduction. I have learned this through trial and error and then deliberate experimentation. I use a lot of deep encased sparkle colors in my work. I had to solve the issue. The smallest amount of reduction can cause the cracking. Just make sure you crank up the O2 and this should no longer be a problem.
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