RogerDeryGemDesign's channel

How to use a gemmological refractometer to get an RI on a gemstone

Tutorial on Specific Gravity Using Hydrostatic Method

Arusha Vocational School - we have been looking at ways to assist the locals in Tanzania to develop skills that will make them employable in the ge...

New MOM (multi-optic machine) faceting of a 4.05 carat lab emerald. Check out the wild optical effects.

This is how I transfer a gemstone by using hot wax

Roy Meade and Will Smith demonstrate dopping faceted stones

Activities of interest in the city of Teófilo Otoni and the International Gem Show ate the source during "Gemstorm 2009". www.geominetour.com

A slide show of some of my customers gems that I have restored

A badly damaged Emerald gets reoriented for best restoration yield.

Charging the Lightning Lap with the BEAST diamond polish available only from Lightninglap.com

After the second dop glue I use the machine to calibrate stones waist at the alignment .

Após o segundo dop para fazer corte da coroa e cintura...

Exploring the Himalaya Tourmaline Mine with Chris Rose and Gary Kratochvil. See an actual tourmaline pocket as it is uncovered for the very first t...

Nick Hodgson of www.astrogems.com explains how he buys gemstone crystal material on the streets in the gem mining areas of Sri Lanka. the challen...