Plated over brass. Nickel-free. OD: Bezel 7.3 x 6.3 x 1.7mm, Post 11mm ID 6.5 x 5.4 x 1 mm.
Can be used with any of the 8 mm Trillion cut stones. It's not a perfect fit, but a dab of glue will hold it.
This is a small setting.
Made in USA. 6.5mm By the pair.