Rough gems

Connecticut has a rich mining history that goes back to the early 1700s. The state's igneous and metamorphic rocks provided ideal conditions for mineral formation, whose crystallization created gems coveted worldwide for decorative and industrial purposes Many abandoned mines and quarries exist throughout the ...

Learn which gemstone you have with this identification guide Identifying an unpolished, rough gemstone can seem difficult, but it really isn't! You can use a streak test to determine the color of the gemstone's powder, which is more...

We invite you to explore this handy guide to help you identify and explore your newest additions to your rock collection.

This lustrous and gemmy lavender colored crystal is doubly terminated. The color is zoned part sapphire and part ruby. Take a look at this unusual piece.

Four basic tests can help determine if a rock is valuable. Learn how to check it's color, look for streaks or markings and test its hardness.

Diamonds which have not yet been cut are referred to as 'rough' or 'raw' diamonds. To identify whether the stone you have is a diamond, you can do a quick visual evaluation to rule out other gemstones. From there, you'll want to perform a...

Three of the oldest of all the gemstones, diamonds, amber, and opals have inspired artists and authors alike with their amazing qualities. These, above all other gems, have captured our imagination. Believed by some to be gifts from the gods, myths and lore have abound about these beautiful gemstones...

Diamonds which have not yet been cut are referred to as 'rough' or 'raw' diamonds. To identify whether the stone you have is a diamond, you can do a quick visual evaluation to rule out other gemstones. From there, you'll want to perform a...

Reference Page. Gemstone Identification Page containing over 24 different gemstones and/or minerals found in Gem Mine Online products. Rough gemstone

Gemstones found in nature don't resemble gems in a jewelry store; they look like any other rock. A field guide can help you locate gem sites and identify them.