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Don't neglect to read up on safety considerations. Crystal balls have been used to record sunshine intensity by burning through cards. Fused quartz spheres created for Gravity Probe B were "the most perfect spheres ever made by humans." But I agree with you, they are bland and personality goes a long way. I vote for the safe choice. That tourmaline inclusion would distract even the best scryer.
I actually saw some forum posts cautioning people not to leave a clear sphere unattended near sunlight, with the insistence that the caution was no joke. I didn't really look into it because the spheres I'm contemplating I feel are cloudy enough to not have that issue. I think. It does have me curious though!