Jet Tumblestones
 
Sold individually in various sizes:
 
2-3 Grams £1.20 each
4-5 Grams £2.00 each
6-7 Grams £2.80 each
8-9 Grams £3.60 each
10-11 Grams £4.80 each
 
Qty 1 peice, Pictures shows a range of sizes
 
Jet is not actually a Crystal but a compressed wood, it is extremely light.