Abraham is the Father of Faith for both Jews and Gentiles. The stars of the heaven represent the Gentiles, and the sand on the seashore represents the Jews.
From Genesis 22:17
Genesis 22:17 Blessing I will bless you, and multiplying I will multiply your descendants as the stars of the heaven and as the sand which is on the seashore; and your descendants shall possess the gate of their enemies.
- Sand, when it is tried by fire, becomes glass (crystal).
- Revelation 22:1 And he showed me a pure river (like the sea of people) of water of life, clear as crystal proceeding from the throne of God and of the Lamb.
Crystal acts like a prism separating Light and throwing it out like a rainbow. (Jesus was the rainbow covenant enacted with Noah)
- Ezekiel 1:28 Like the appearance of a rainbow in a cloud on a rainy day, so was the appearance of the brightness all around it. This was the appearance of the likeness of the glory of the Lord.
The universe extends far beyond our own galaxy, The Milky Way, which is why scientists can only estimate how many stars are in space. However, scientists estimate the universe contains approximately 1,000,000,000,000,000,000,000,000 stars, or a septillion. While no one can actually count every single grain of sand on the earth, the estimated total from researchers at the University of Hawaii, is somewhere around seven quintillion, five hundred quadrillion grains. There are more grains of sand on the seashore than there are stars in the universe.
- Genesis 22:17 blessing I will bless you, and multiplying I will multiply your descendants as the stars of the heaven (a septillion: 1,000,000,000,000,000,000,000,000) and as the sand which is on the seashore (seven quintillion, five hundred quadrillion grains); and your descendants shall possess the gate of their enemies.
- Hebrews 11:12 Therefore from one man, and him as good as dead, were born as many as the stars of the sky in multitude—innumerable as the sand which is by the seashore.
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Quantum Study Bible 