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Re-polishing the Crown of a Tanzanite.

A jeweler contacted us regarding a large Tanzanite mounted in a heavy ring. The Tanzanite showed heavy wear and needed re-polishing.

When they emailed me a photo of the piece, the color looked like a synthetic Sapphire because it was such a pure blue with none of the usual violet secondary color.

When I received the ring, I tested it on my refractometer and, sure enough, it was a Tanzanite.

An emerald cut Tanzanite mounted in a ring.

Tanzanite mounted in a ring

The jeweler sent me the ring with the Tanzanite still mounted in the ring. They asked me if I could remove the stone. I told them that I could.

click this photo

The Tanzanite has been removed from the ring.

I removed the Stone from the ring

I used a separating disc to carefully remove the gold tab from one side of the ring which was holding the stone in place.

The stone is now ready to epoxy to a dop stick and mount into my faceting machine.

The emerald cut Tanzanite mounted in my faceting machine.

Ready to be polished

The stone in now mounted in my faceting machine and ready to be polished.

I need to find each angle and each index to re-polish the facets and give them a high polish

In the process of polishing the stone.

Being polished

You can now see that many of the facets have been polished and the scratches and chips are gone.

The finished Tanzanite sitting next to a dime.


The stone is now finished and looks like new again!

The finished weight was just over 22 carats.

→  Take me back to examples of Making the Crowns of Gemstones like new again


Denton Anderson,
Gemologist & Gem Cutter
click photo for Video

Photo of Denton the gem cutter.

Graduate Gemologist, GIA, GG
Over 20 years of experience.