Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: 925 Sterling Silver 7mm CZ Heart Stud Earrings Clear Cubic Zirconia April Birthstone
Product description: 925 Sterling Silver. Attractive pair of Clear Stud Post Earrings. The Heart has a 7mm size. Price is better than bargain. All good reasons to use buy it now. Visit our store for more colors and shapes. Thanks for shopping Gem Avenue.
Product feature: SPECIFICATIONS: Pure 925 Sterling Silver. Nickel Free., FASHION: New, Unique jewelry suitable for everyday wear or party. Lightweight & beautiful, Simple gifts are always the best. Silver earrings make great stocking stuffers or impromptu gestures of affections. Silver Earrings are low key and easy to pair with outfits, so it makes a great year round gift for yourself or someone else. French wire, leverback, fish hook and many more earring styles all are beautiful and easy to pair., These earrings arrives in a free gift box. These earrings are perfect for your wife, girlfriend or soon to be fiance. Great for Christmas, anniversary, valentines or birthday gifts. Treat your loved ones to beautiful silver earrings., 30 day money back guarantee with any order. exceptional customer service. Gem Avenue is committed to making our customers happy. We inspect every item before shipping. We ship from the USA. Fast, secure and reliable delivery. Orders are shipped within 24 hours except on weekends., Product Dimensions: 6.2 x 4.5 x 1.4 inches, Shipping Weight: 1.44 ounces ( View shipping rates and policies ), ASIN: B0012NHRDC, Item model number: TDEZ2210-C, Date first listed on Amazon: January 13, 2015, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product price: $7.99
Product brand: Gem Avenue
Target attributes: Silhouette
Answer: attribute: silhouette
value: stud
source: product description
attribute: silhouette
value: stud
source: product title