Everything you ever wanted to know about sapphire gems. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
Although Tanzania is a source of rubies, so-called Serengeti rubies are more likely to be garnets. Learn more about rubies and misleading gem names here.
Polishing sapphire gemstones can be tough on laps. Learn the pros and cons of different laps and some techniques to save time and money.
Polishing synthetic corundum without leaving pits requires certain techniques and tools. Get expert lapidary advice here.
In Exodus, the breastplate of Aaron was said to hold 12 gems. However, the gemological identities of the stones, like jacinth and sapphire, are debatable.
Silk inclusions in sapphires are hard to detect. Learn to pick the best orientation and cut for these gems. You might end up with a prize star sapphire.
Rubies and sapphires can be made in a lab. The process that yields the best synthetic corundum for faceting should give you the best return for your work.
Curved striae or lines are a telltale sign of synthetic ruby and sapphire. If you're having trouble seeing them, here are some helpful tips.
Want to start cutting beautiful star gemstones? Here are some helpful gemological resources for novice lapidaries and jewelers.
Where do the best rough sapphire stones come from? It depends on the color. Blue may be the most valued color, but these gems pose problems for faceting.