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Forsterite is a colorless to greenish transparent member of the olivine mineral family, which also includes peridot. Forsterite has a heavy magnesium chemical composition and large crystals are not common, but they are highly sought after by collectors.

This mineral species can be opaque to crystalline transparent. The color of lazulite ranges from medium to dark greenish blue to violet blue and is often mottled with white. When fashioned into gems, finished stones typically weigh less than 5 carats. A separate mineral species, lazulite should not be confused with lazurite or azurite.

Gabbro is a rock that is made up of calcium rich plagioclase feldspar and pyroxene, usually augite. Gabbro is found in a variety of locations and has even been discovered on the moon. The colors of gabbro are typically dark gray to black with a medium to coarse texture. It is a favored medium in architectural designs.

Opalite is a man-made opalescent glass. When opalite is placed against a dark backdrop, it takes on a luminous blue or pink glow. Blue opalite has even been confused for moonstone at times.

The chemical vapor deposition (CVD) process deposits a thin film onto part of the surface of a colorless quartz gemstone. This creates an eye-catching rainbow effect as light passes through the gem, resulting in an unbelievable array of colors.

Variscite is a phosphate mineral that is translucent to opaque with green to bluish green coloring that is often mottled or veined. This gem is commonly cut en cabochon or used for carvings. With a similar appearance to green turquoise, variscite is named for its location of first discovery in Germany. When mined in Utah, some prefer to call it Utahlite.

Moonstone is a variety of feldspar that displays an amazing optical phenomenon called adularescence. Internally repeating feldspar layers scatter the light that enters the stone, creating a mystical glow reminiscent of moonbeams. This glow comes to life, rolling across the gem’s surface, when it is moved. Adularescent labradorite with a multi-colored glow is sometimes called Rainbow Moonstone.

Siderite was discovered in 1845 and derives its name from the Greek sideros (iron). Siderite has perfect cleavage in three directions and comes in a wide variety of crystal habits and colors.

One of the most coveted varieties of chalcedony quartz, chrysoprase is prized for its apple green color and rarity. Chrysoprase's name comes from the Greek words chrysos meaning “gold,” and prason meaning “leek,” due to its color similarities with the vegetable.

Axinite is an uncommon mineral that usually occurs in long, flat, axe-shaped crystals, a trait that makes it highly desirable to collectors who enjoy adding various crystal forms to their collections. Its strong trichroism only adds to its special appeal. As it is rotated, different colors are displayed, including rich cinnamon browns, violets, blues or greens.

Bloodstone is green jasper dotted with bright red spots of iron oxide. The green color is caused by small particles of chlorite, a silicate mineral or hornblende needles interspersed throughout the host material. Its distinctive reddish spots are caused by the presence of iron oxides.

Chalcedony is a broad gemstone family of many varieties of cryptocrystalline quartz gemstones. Chalcedony usually has a waxy luster and appears in a great variety of colors including blue, white, buff, tan, green, red, gray, black, yellow or brown. Different colored varieties of chalcedony have individual names including agate (banded), bloodstone (green with red spots), chrysoprase (apple green), carnelian (orange to red), flint (dull gray to black), jasper (spotted red, yellow, brown or green) and sard (light to dark brown).