Genesis 24 - The Sixth Commandment. Honoring God's gift of sex

In our series on the Ten Commandments we are at the sixth (thou shalt not commit adultery - or to put it in more modern day parlance: "sex is a big deal to God, He invented it and He can help you use it correctly so that you don't get burned and leave a trail of brokenness in your life.")

The passage we are using for the main message is from Genesis 24 where Abraham has his Property Manager take a 500 mile trip to find a wife for his son Isaac.

here is one clip from the text:

Genesis 24:¹⁹ After she had given him a drink, she said, “I’ll draw water for your camels too, until they have had enough to drink.” ²⁰ So she quickly emptied her jar into the trough, ran back to the well to draw more water, and drew enough for all his camels. ²¹ Without saying a word, the man watched her closely to learn whether or not the Lord had made his journey successful.
²² When the camels had finished drinking, the man took out a gold nose ring weighing a beka^[c] and two gold bracelets weighing ten shekels.

So my question to you is, "What is a beka?  How much gold would that be and roughly what would it be worth?

Here's a hint:  at that time they weighed out silver and gold on scales with small round stones as the counterweight.