Gemstone Entertainment

1st Logo (1987-2002)
Visuals: There is rainbow lines cut off by a gemstone. The word "GEMSTONE" is in a chrome font above the rainbow lines and gemstone while "ENTERTAINMENT" in the same font and chrome color is below them.

Technique: None.

Audio: None.

Availability: Can be seen on public-domain releases of the time on VHS & DVD.

2nd Logo (1989)
Visuals: On a blue gradient background, a gold gem fades in on the top, followed by "GEMSTONE" and then "ENTERTAINMENT" on the bottom.

Technique: The gem and text fading in one by one.

Audio: None.

Availability: Only seen on the VHS release of Microbes.