Crystal Specimen Display Stand - Acrylic
Sizes: Small 5cm, Medium 6.5cm, Large 9cm and XL 11cm.
 
Small is great for crystal specimens 7-10cm.
Medium would be better suited for crystals slighter larger then 10-15cm.
Large is for crystals that are around 15-20cm.
XLarge is designed for holding specimens or boulders larger then 20cm plus.