Aletto Brothers 18k yellow gold cluster ring with Amethysts and Diamonds. 

Natural Amethysts are 6 mm in diameter; estimated total weight of small round diamonds is 0.46 ctw. 

The ring is 6; sits approx. 17.07mm from the top of the finger. The band tapers from 1.45mm to 2.29mm on the bottom. The weight of the ring is 20.88mm.