need more information to give you an accurate estimate of the value of your ELCO Praying Hands Serenity Prayer Pendant. Here are some factors that would affect the value:

Material:

• You mentioned it's 14kt gold filled. Is it gold filled over sterling silver or a base metal? Gold filled over sterling silver is more valuable than gold filled over a base metal.
• Is there any gold vermeil or plating on the pendant? If so, how thick is it? Vermeil or plating is thinner than gold filled and will wear off over time, which can affect the value.
• Are there any gemstones or other materials in the pendant? If so, what are they and what is their quality?

Condition:

• Is the pendant in good condition? Are there any scratches, dents, or missing parts?
• Is the gold fill intact or is it worn away in any areas?
• Is the clasp in good working order?

Age and rarity:

• How old is the pendant? Vintage pieces can be more valuable than newer pieces, especially if they are rare or in high demand.
• Is the pendant a signed piece by ELCO? Signed pieces are generally more valuable than unsigned pieces.
• Do you have any documentation or provenance for the pendant? This can add to its value.

Market:

• What is the current market value for similar pendants? This can vary depending on the factors mentioned above, as well as the overall demand for vintage jewelry.

Once you can provide me with more information about the pendant, I can give you a more accurate estimate of its value.

In the meantime, I can give you a general range of what similar pendants have sold for at auction:

• Gold filled ELCO Praying Hands Serenity Prayer pendants: $50 - $200
• Vintage gold filled pendants: $25 - $150
• 14kt gold pendants: $100 - $500 (depending on the weight and design)

Please keep in mind that these are just estimates and the actual value of your pendant could be higher or lower.

I hope this helps!