This article is a summary of a YouTube video "How are gemstones cut faceting a 30ct Brazilian amethyst" by Stuart Gems

Faceting a Brazilian Amethyst: Maximizing Color and Brilliance

TLDRWatch as expert lapidary Andrew Stewart facets a beautiful Brazilian amethyst using a Portuguese style cut. Learn how this cut enhances the color and brilliance of the stone, resulting in a stunning pinkish purple gem weighing over 91 carats.

Key insights

💎The Portuguese style cut is designed to maximize the color and brilliance of gemstones.

🔪Lapidary Andrew Stewart uses a 260 grit flat lap to start cutting the gemstone.

🌊Water is used to cool and lubricate the gemstone while cutting.

🌟After cutting the pavilion facets, Andrew Stewart changes to a 600 grit lap to remove heavy scratches.

💎The gemstone is pre-polished with cerium oxide on a composite lap to prepare for the final polishing stage.

Q&A

What is the Portuguese style cut?

The Portuguese style cut is a faceting technique that is designed to maximize the color and brilliance of gemstones by enhancing their depth of color and overall brilliance.

What grit lap does Andrew Stewart start cutting on?

Andrew Stewart starts cutting on a 260 grit flat lap.

How is water used during the cutting process?

Water is used to cool and lubricate the gemstone while cutting, preventing overheating and minimizing friction.

What is the purpose of pre-polishing?

Pre-polishing is done to remove heavy scratches and prepare the gemstone for the final polishing stage, ensuring a smooth and polished surface.

What is used for the final polishing stage?

The final polishing stage is done with cerium oxide on a composite lap, resulting in a high-gloss finish.

Timestamped Summary

00:00Andrew Stewart introduces the video and showcases the Brazilian amethyst, a pinkish purple gemstone.

01:01Andrew Stewart starts cutting the gemstone using a 260 grit flat lap.

01:54Water is used to cool and lubricate the gemstone while cutting.

04:30Andrew Stewart switches to a 600 grit lap to remove heavy scratches.

05:44Pre-polishing is done on a composite lap with cerium oxide.

06:35The gemstone is transferred to a new dop using a transfer jig.

09:11Andrew Stewart starts cutting the crown facets.

09:55The gemstone is fully cut and polished, resulting in a stunning 30-carat stone.