Hi, I'm relatively new to crystals and am having trouble telling fakes from the real thing. I've noticed in shops crystals can be extremely expensive and as I'm a student on a tight budget I've turned to eBay. Recently two specimens that gave caught my eye on eBay are this jasper agate sphere and a clear quartz cluster. I've seen clear quartz clusters such as this one sell on this users account for up to 50 pounds as it is a very large lump of quartz. This quartz however has no bids and as m wondering should I bid? I know quartz can be easily faked and can often just be glass so I really need some help!! Have attached a photo of the quartz. The ocean jasper is also relatively cheap and I know this specific rock is now quite rare so am very skeptical. I don't know much about faking crystals but it looks extremely convincing and beautiful in its own right, however, I would not like to waste time on a fair. Please help me a beginner out!!