| Carbon | 79. |
| Hydrogen | 10.5 |
| Oxygen | 10.5 |
Amber is imitated by gum copal, and even the insect enclosures which occur in real amber are copied.
These imitations can be detected by placing the specimen in water or alcohol. This is also a good test for pieces of real amber that have been melted or glued together.
Amber is thrown up by the sea, in rivers near the sea, or on the sea-shore, and has been found in nearly all parts of the world.
The Russian, Baltic, and Sicilian coasts have yielded the larger portion of the production, but supplies come also from Galizia, the Urals, Poland, China, and the United States.
For ornamental purposes the faceted amber beads are largely used, but of late years these have been closely imitated in glass.
Coral.
Coral, although not a precious stone, has been largely used in jewelry, and as some of this beautiful substance is very valuable, a few words will not come amiss.
Red or precious coral is the work of a family of zoöphytes which live mostly in cavities of rock in the sea.
These polyps build their homes at a depth of two to seven hundred feet under the surface of the sea, and although the single groups of coral are sometimes several feet long, the usual size is about twelve inches high, and about one inch at the thickest part of any single branch.