Other stones have sharp color changes. These stones might have patches of green in contact with an area of strong red color. Some exceptional stones are pleochroic - their color depends …

The cab at the top left is the best fit for the bloodstone definition. It has spatters of "blood" that are less than "most desirable." The top right stone and the bottom left stone are also good …

Consumers enjoy their visually perfect clarity and exceptional color, along with a price that is a fraction of what would be paid for natural stones of similar color, size, and clarity. They have …

Moissanite and cubic zirconia have dispersions that are competitive with diamond, and the dispersion of strontium titanate is over-the-top. In the photo above, the strontium titanate is a 6 …

Some topaz is coated with a metallic oxide that gives the stone a multicolored iridescent luster. These stones, known as "mystic topaz," appear to change color if the observer moves the …

It is used to produce faceted stones, cabochons, beads, tumbled stones, and many other items for jewelry and ornamental use. Amethyst has a Mohs hardness of 7 and does not break by …

Today dyed howlite and magnesite are still used to make mass-produced beads, cabochons, tumbled stones, and other turquoise look-alike items. They are almost ubiquitous in the …

They are also known as "polished stones," "tumbled gems," "baroque gems," "polished rocks," and a variety of other names. Many people enjoy tumbled stones because they are beautiful …

The wide range of compositions and color zoning within crystals causes tourmaline to occur in more colors and color combinations than any other mineral group. Tourmaline is one of the …

In the sections below we feature Oregon sunstone, thundereggs, opal, and the chalcedony gems of agate and jasper. Oregon has many other gems, which include obsidian, garnet, jade, …