I recently got to review an onyx bracelet from Medu Jewelry and it had a sterling silver clasps. It has 10mm round onyx with 7 inch long and hypoallergenic. I do not own a piece of onyx so this was nice to add to my jewelry collection. For someone who does not know much about this stone I would like to share with that it is Onyx is a member of the quartz family, and more specifically of the chalcedony group. This is a type of fibrous quartz that displays bands of color within a gemstone. Even more specifically, onyx is a variety of agate, which displays fibrous bands in white and black, sometimes with gray, although most often the stone is dyed so that it appears pure black. While black onyx is the most famous, there is also Sardonyx, which features slim red bands running through the black stone.
My Opinion: I like the piece as it is different then what I already own. The clasp is hard to open and when I put it on it fits just fine.
They offer a free jewelry program with each month you are a member you will get free jewelry where you just pay the shipping cost of $6.99 but the piece you get is worth $100-$200.