A domed front and a flat back.

This is Biggs jasper from the Owyhee Mountains in Oregon.

Click on the photo for a 'Blow-up' view of the cab.

These cabs are cut with the intention of wire wrapping them. They will have a square edge of at least 1/32" to hold the wire. This applies to whether they are polished on one side or both sides. To borrow a term from our faceting friends, this edge will be referred to as the 'girdle'