OK lets look at this more closely.

Is the sign and wonder meeting a need?
Is it confirming the Word (the gospel of the grace of God)?
Is it pointing to Jesus as Messiah?
Is it glorifying His Name?

Mark 16:20
And they went out and preached everywhere, the Lord working with them and confirming the word through the accompanying signs. Amen.

We can see from the above scripture that the signs are supposed to confirm the word that has been preached. In some meetings that are called revival meetings no word has been preached. Todd Bentley boasted recently that he hasn't been able to preach in a meeeting for 3 weeks!!!

Some things have a more obvious spiritual precedent - example oil which was for anointing and healing and also representative of the Holy Spirit. I cannot see a precedent for the jewels.

Look for a strong biblical precedent
Pray earnestly
Train your spirit to discern by immersing yourself in the Word.

Heb 4:12
For the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart.