Seam location in stone counters (i.e. granite countertops and quartz countertops like Zodiaq and Silestone) is often up to the discretion of the fabricator. We strive to make the placement in the most aesthetically pleasing location based upon job size, slab irregularities (this is mainly with natural stones) and edge style. With Hi Macs and Corian countertops the seam locations should not be visible.
The following are some basic guidelines:
Butt Seam (pictured below) : Used primarily for Eased (square) and Bevel Edges. No inside radius. This option may also need to be used for the best yield of a slab.

Masons Miter (pictured below) : Used primarily for Bullnose and Half Bullnose Edges. No inside radius.

Offset Seam (pictured below) : Used Primarily for Ogee Edges. Has approximately 3" inside radius.

Miter Seams (pictured below) : Used for counters with angle less than 90 degrees. Has no inside radius.

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