What does Spiral Shell look like on HTC?

On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.

When did HTC add Spiral Shell?

HTC first drew Spiral Shell in Sense 7, released March 30, 2015.

HTC Corporation has shipped 2 versions of Spiral Shell. Each is dated, so you can see when the design changed.

HTC

HTC Corporation has drawn Spiral Shell 2 times. Every revision HTC has shipped is below, newest first.

What does Spiral Shell look like on HTC?: On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.
When did HTC add Spiral Shell?: HTC first drew Spiral Shell in Sense 7, released March 30, 2015.
How many times has HTC redrawn Spiral Shell?: HTC Corporation has shipped 2 versions of Spiral Shell. Each is dated, so you can see when the design changed.

HTC artwork for this emoji spans 2015 to 2016.