I got this from a website called God's Knot. They sell the chords but you could easily make it yourself
Ecclesiastes 4:12, “Though one may be overpowered, two can defend themselves. A cord of three strands is not quickly broken.
”Today, [name of groom] and [name of bride] have been woven together by God as ONE in marriage."
The cord of three strands symbolizes the joining of one man, one woman, and God into a marriage relationship. Marriage takes three; you, your soon to be spouse, and God. It was God who taught us to love. By keeping Him at the center of your marriage, His love will continue to bind you together as one throughout your marriage.
The cord of three strands ceremony is a great addition to a traditional wedding ceremony. It adds a truly unique element to your ceremony that friends and family will remember. It can also serve as a substitute for the unity candle. This is useful for situations where candles may not be used, or may be difficult. The Cord of Three Strands works well as a substitute in outside weddings.
At some point in the wedding ceremony, the bride and groom braid the Cord of Three Strands together. The groom holds a small metal ring with three attached strands. The bride then braids the strands together, symbolizing the union of God, husband and wife. The colors of the cords is significant.
Gold Strand - Represents God
The divinity of God is represented in Gold. This covenant relationship is initiated by Him, will be built under His authority, and is intended to glorify Him.
Purple Strand - Represents the Groom
As a new creation in Christ, the majesty of the Groom is represented in purple. As the husband loves his wife and submits himself to the Lord, the Lord in turn will demonstrate His great love in the marriage relationship.
White Strand - Represents the Bride
Having been cleansed by salvation in Christ, the purity of the Bride is represented in white. As the wife honors her husband and submits herself to the Lord, the Lord in turn will nurture and strengthen the marriage relationship.