This is a basic 3-cord abalone knot with some beads added. The 2 outer red cords represent how you (the middle cord) are wrapped in God's love. The red colour also reminds us of how Jesus' blood has washed us white as snow and that is symbolised by the ring of white beads (purity) which surrounds you - the purple bead with the colour purple illustrating your royal status as a prince/princess of God.
If you look closely at the envelope, you will find a couple of sparrows in the picture. That made me think of Matthew 10:29-31:
Are not two sparrows sold for a penny? Yet not one of them will fall to the ground outside your Father’s care. And even the very hairs of your head are all numbered. So don’t be afraid; you are worth more than many sparrows.
Indeed, you are greatly loved and very precious to God. You are much more valuable than many sparrows. He has redeemed you and you are His prince/princess!
Other mizuhiki creations explained: