'by Donald Clark, CSM IMG'

Is a flat lap to dop swing really necessary? Learn how a gemstone should contact a faceting machine lap and get some advice for adjusting your equipment.…

To pick the right cut for a gem, you need to figure its maximum potential shape. Preforming gemstone rough is essential for making the design a reality.…

A quartz wedge can be used with a polariscope to help a gemologist distinguish the + or – optic sign of a gem. Learn how to make and use one.

What factors determine the light return of faceted gemstones? Facet quality, polish, color, and cut style all play roles. Learn more about these…

What are the best facet designs for novice gem cutters? Find recommendations for cutting styles, books, resources, and gemstone rough here.

Dark green tourmaline and red rubellite gems can look very black in an emerald cut. Learn how to minimize this effect and show off these rich colors…

How do you start making a living in the jewelry trade? You need to learn gemology and metalsmithing and get serious about sales. Here are some tips.…

Learn why citrine gemstones are sometimes misidentified as topaz. A professional appraisal by an independent gem lab is the best way to identify…

Learn what factors most influence a sphalerite appraisal and what kind of jewelry will best showcase this beautiful gemstone.