This is an example of a monchromatic color scheme.
From Wikipedia:
Example of Monochromatic colorMonochromatic color schemes are derived from a single base color, and extended using its shades and tints (that is, a color modified by the addition of black and white). As a result, the energy is more subtle and peaceful due to a lack of color contrast. Monochromatic colors offer very little contrast and may be considered boring unless there is diversity within the design.
This color scheme worked very well for the Dutch Spiral bracelet below.
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Using different size beads in the spiral created the diversity within the design.
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While revisiting this technique, I experimented and discovered a little trick to make the spiral pop.