Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Faceted Blue Topaz/Moonstone Earrings
Product description: Sterling silver round blue topaz and oval moonstone earrings. Blue topaz is 5mm and the moonstone is 12mmx9.5mm. Earrings are 34.5mm in length. .925 Sterling Silver, from Driscoll's Jewelry & Gifts
Product feature: Shipping Weight: 6.1 ounces, ASIN: B005WXC8FU, Date first listed on Amazon: October 18, 2011, Average Customer Review: 4.0 out of 5 stars 1 customer review
Product brand: Driscoll's Jewelry & Gifts
Target attributes: Silhouette
Answer: attribute: silhouette
value: None
source: None