This is two very different concepts. Which one to use depends on the call.
For calls that involve sequences of arm turns (Swing Thru, 1/4 Thru,
Swing the Fractions, etc.) all arm turns that would involve centers and ends
are turned into that many Diamond Circulates, and all arm turns that would
take place in the center are done just by the center two people.
\sxvdiamonds{g1e,b1s,g2w,b2n}
\sxvdiamonds{g1e,b1s,g4w,b2n}
before Diamond Remake (not to be confused with Remake the Diamond)
after
All handedness requirements of the call must still be met. The
diamond handedness must be consistent.
\sxvdiamonds{g1w,b1n,g2e,b2s}
\sxvdiamonds{g2w,b4n,g1e,b1s}
before Diamond Swing Thru
after
Otherwise, it must be a 2-person call. The points of each diamond do
that call in their disconnected setup. If the call is a shape-changer
(e.g. Shazam) they go into the center spots of the diamond. The
centers of each diamond also do the call. If the call is a
shape-changer they go into the point spots of the diamond. In all cases
the diamond's orientation remains the same.
\sxvdiamonds{g1n,b1e,g2n,b2e}
\sxvdiamonds{b2n,g1w,b1n,g2w}
before Diamond Single Shake and Rattle
after
There are also a few calls that have "diamond" in their names, such
as Diamond Recycle and Diamond Inlet. They are not related to these
concepts.