- Brand: Casa de plata
- Product Code: CSER-330
- Availability: By Order
Onyx is black and white banded agate
(cryptocrystalline or chalcedony quartz). It should not to be confused with
onyx marble, which is limestone. The banding of onyx is parallel and
consistent. Some varieties of onyx differ in color, such as sard onyx, which
has a brown base and white upper layer, cornelian onyx, which has a red base
and white upper layer, and niccolo onyx, which has a very thin upper layer,
allowing the black base color to show through as grey or blue.
Smoky quartz is faceted or cut into beads and cabochons. These gems are often used in rings, pendants, necklaces, earrings, and brooches for people who like the yellowish brown to brown color.Smoky quartz with a dark brown color is often used in men's rings and cufflinks. During the Victorian Period, dark brown stones from the Mourne Mountains of Ireland were often used in mourning jewelry.Because smoky quartz has a low price and large pieces are easily obtained, it is a favorite practice material of people who are learning to facet. It is also frequently used as a carving material.