There are two cases:
1. Available: We have Mixed Products zone where the items are mixed by color or shape. You can pick out what you like.
2. Unavailable: For example, "I would like to buy 20 strands of 4mm round cat's eye beads. Can I purchase 5 strands in white, 7 strands in blue, 8 strands in yellow?" --We are very sorry but we can not provide you the beads in such mixed colors as each item on our website has a minimum quantity required.