Susie Smith posted on June 14, 2010 07:28
The National Button Society Classification identifies Section 8 – Glass Mounted in/on Metal as:
Includes black, clear and colored glass, and imitation gemstones mounted in/on metal using various settings and techniques. Glass should be the focus of the button. Metal buttons with glass embellishment belong in Sec. 10. Buttons with equal emphasis on glass and metal are acceptable here as well as in Sec. 10. Unless clearly qualifying as glass mounted in metal, Gay nineties, due to their diverse nature belong in Sec. 23. Glass mounted on metal by way of pin shank or glue is acceptable. Includes some protrusions (button focus is glass protruding through cut-out metal). Not included are glass metal backs (Bimini, kaleidoscope, mirror, riveted). All other materials mounted in/on metal belong in their own material section/class or in Sec. 23. Refer to page 79, Materials mounted in/on metal.
These are examples Section 8 buttons were presented to the Club in January 2010
8- 1 Black glass. All types of black glass mounted in/on metal including
waistcoat/vest buttons (formerly called weskits).
and
8- 2 Clear and colored glass. All types of clear and colored glass mounted
in/on metal including waistcoat/vest buttons (formerly called weskits).
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 Section 8-1 and 8-2 -- Cameos 
Section 8-2 -- Opalescent glass 
Section 8-2 -- Saphiret glass |
| Section 8 - 3 Drum with glass center. Div. I. May have clear and colored glass or black glass centers. Drums with other material centers belong in Section 23 or appropriate material section. Refer to page 77.
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Section 8-3 -- Drum buttons
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| 8- 4 In/on/under glass assorted. Includes buttons with transparent glass as a shield for the design, reverse painting on glass and designs in/on/under glass. Design may be pictorial or non-pictorial. Designs of other materials under a glass shield may be used in their appropriate material sections as well as in this class. 8- 4.1 One-piece mounting. Div. I. Characterized by a mounting with no separate rim, these buttons have a thin rolled-over edge and an attached ring or self shank. Glass “designs” are varied. Some have a molded surface, either front or back, with added luster or paint enhancement. Many have iridescent liners of celluloid, pearl or foil as a reflective background behind the glass giving them a three dimensional effect. Opaque molded glass is not appropriate here. 8- 4.2 Shield. Undecorated glass used only to protect a material underneath (no reverse painted). |
8-4-2 -- Design under glass with shield
The 'shield' or cover is a separate piece of glass above a flat design on paper, fabric, etc. 
Section 8-4 -- Design under glass
This photo includes an intaglio reverse painted horse, and shows a one-piece mounting from the reverse. |
8- 5 Imitation gemstones. Glass, faceted or cabochon shaped, imitating precious and semi-precious gemstones in various settings. May be opaque (imitating coral, jade, etc.) or transparent (imitating rubies, diamonds, etc.). Plastic imitating glass and actual gemstones are not appropriate here.
8- 5.1 Rhinestones/pastes. Transparent glass imitating precious and semiprecious jewels. Typically foil backed, they include all colors, as well as colorless (may have iridescent finish); awards may specify color and/or type desired. Mountings include single, multiple, claw, prong, bezel, pavé, channel, 48 National Button Society Classification for 2009-2010 Competition etc. Does not include faux pavé. Refer to page 78. |
8-5 -- Imitation gem. Includes glass 'turquoise' and 'tiger-eye'.
8-5-1 – Paste |
| 8.6 Unlisted |
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| 8-6 -- Unlisted -- includes these buttons with both black and opaque glass |
Some of my favourites |
More favourites. Centre button is imitation fabric black glass set in faux wood-painted metal. |
By Sue Dickout, January 2010