At a guess, I would say that it's to distinguish it from the more masculine connotations of "jet" as either a plane or a color, and so to avoid having gender-y valances to what are supposed to be gender neutral terms. Ron, is that right? Or am I missing the mark here?

On Thu, May 28, 2015 at 8:11 PM, Eric Black via Callers <callers@lists.sharedweight.net> wrote:
Why have to explain that a “jet” is a gem?  Just say that it’s very different from “ruby” so they are not easily confused in a noisy room.
-Eric

On May 28, 2015, at 1:48 PM, Ron Blechner via Callers <callers@lists.sharedweight.net> wrote:

I have had to explain that "a jet is a gem, not the airplane or a West Side Story gang" to a ton of people. So I feel this is more confusing than a ruby being a gem.

On May 28, 2015 4:25 PM, "Aahz Maruch via Callers" <callers@lists.sharedweight.net> wrote:
On Thu, May 28, 2015, Alan Winston via Callers wrote:
> On 5/28/15 12:30 PM, Ron Blechner via Callers wrote:
>>
>>For those interested in gender free contra dance terms:
>>
>>1. Do you like or dislike jets / rubies ?
>
> Like. (I'm responding on personal preference alone; I'm aware of some
> objections to this, which I don't personally share.)
>
>>2. How would gems / rubies compare?
>
> Less good, because the soft "ms" would make the call less clear. Also,
> rubies _are_ gems, so this is confusing.

Ditto all this.
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