Lapis

[Yuval_Menachem_Hemi]

How can I polish lapis cabochons ?

Hemi Englisher, GemCal Co.
21/6 Rajple 2 Cha-Am, Petchaburi 76120
Thailand.

http://www.ganoksin.com/kosana/gemcal/spinel.htm
Fax # 6632 434015
Tel # 661 4457742

[Mark_Zirinsky]

For polishing lapis cabochons:

Using diamond grits, a prepolish series of 1200 and 14,000 grit, followed by 50,000 for final polish.

This seems to work better than cerium oxide. I have not tried tin oxide on lapis.

Mark Zirinsky
Denver, Colorado, USA

[Dave_Stephens]

How can I polish lapis cabochons ?

Use Linde A on a leather flat lap, I think tin oxide would do the same. Make a slurry of the powder with a drop of soap and a drop of vinegar. Put a little on the leather and drap the

cabochon polishing it with the leather almost dry....DAve

Art Jewelry for Conscious People
http://www.opendoor.com/stephensdesign/crystalguy.html

[Mark_Liccini1]

After a good prepolish,you use powdered Alumina.A good frade is .3 micron.It is sold under the trade name "Linde A".I did Lapis cabs to high polish in tumbler.We used Edus Automatic

cabbers,diamond wheels,to a carbide sand,then a 1200 diamond prepolish on a pelon type sleeve over the drums.Then we waxed them.This was the magic.

Mark Liccini
LICCINI
Gemstone Rough Dealers since 1970 U.S.MAIL E-Mail: @Mark_Liccini1 107 C.Columbus Dr.#1A http://www.LICCINI.com Jersey City,N.J.07302 Voice Mail/Fax: 201-795-1115