Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Accented Flower Cluster Center Cubic Zirconia Ring Sterling Silver 925
Product description: Accented Flower Cluster Center Cubic Zirconia Ring Sterling Silver 925
Product feature: Sterling Silver 925, Cubic Zirconia, Imported, Comes in a Cotton Filled Gift Box, Organza Bag or Velvet Bag, Shipping Weight: 4.8 ounces ( View shipping rates and policies ), ASIN: B00D6Z5C7W, Date first listed on Amazon: June 5, 2013, Average Customer Review: 5.0 out of 5 stars 2 customer reviews
Product price: $22.40
Target attributes: Silhouette
Answer: attribute: silhouette
value: None
source: None