dealsnot an earring...a gear ring! by kinekt for $165…

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You should be able to buy one. The site says:

It is currently available for purchase in sixteen standard US ring sizes: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 & 20.

Size 8 is listed and I was able to add it to my cart.