This Square cuff link is made in Purpleheart (Petogyne Venosa), and once again this is the natural colour of the wood, the colour is caused by the sap in the wood, some users of the wood will bake the wood to deepen and darken the colour but I do not agree with the practice as it can increase the wastage as the wood will split and warp with this practice
The Squares are aprox 2cm Sq

The backs are Silver plated