What are the three Apple Watch collections?

What are the three Apple Watch collections?

The Apple Watch is available in three different collections. Within each collection are a variety of cases and bands to choose from.

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Apple Watch
Stainless steel or space black stainless steel cases
Sapphire crystal face

Apple Watch Sport
Anodized aluminum cases in silver or space gray
Strengthened Ion-X glass face

Apple Watch Edition
18-karat yellow gold or rose gold cases
Sapphire crystal face