My dog has one of these studded heart collars in orange!  They come in a colour choice of orange, red or blue and feature diamante studs along the length of the collar.  In the middle of the collar is a metal heart.

Available in sizes XXS - M

XX Small - Fits neck 16 - 21cm x 2cm width

X Small - Fits neck 20 - 26cm x 2cm width

Small - Fits neck 27 - 32cm x 2cm width

Medium - Fits neck 32 - 38cm x 2cm width