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: Heart Shaped CZ Stud earrings Rose Gold Plated 7mm
Product feature: These 7mm heart shapes rose gold studs have CZ faces, the April birthstone, giving them an elegant and lovely feel, perfect for a wedding, valentines day or an anniversary gift, for anyone with pierced ears., Measure: 7mm x 7mm Weight: 2.5 Grams Material: .925 Sterling Silver, Cubic Zirconia, Gold Vermeil, Material: .925 Sterling Silver, Rose Gold Plating, Cubic Zirconia, Free elegant black velvet pouch, earrings make a great gift for Mothers Day, Anniversary, Wedding, Birthday, Christmas, Valentines Day, Graduation Gift for Sister, Mother, Mom, Grandmother, Daughter, Wife, Girlfriend, Aunt, Mum, Grandma, Female Friend or Treat Yourself, 30 Days Money Back Guarantee combined with world class customer service no question asked. Bling Jewelry offers best quality without compromise. We individually inspect each of our products, to make sure you are only getting the very best from us., These 7mm heart shapes rose gold studs have CZ faces, the April birthstone, giving them an elegant and lovely feel, perfect for a wedding, valentines day or an anniversary gift, for anyone with pierced ears., Measure: 7mm x 7mm, Weight: 2.5 Grams, Material: .925 Sterling Silver, Cubic Zirconia, Gold Vermeil, Package Dimensions: 3.8 x 3.1 x 1 inches, Shipping Weight: 1.6 ounces ( View shipping rates and policies ), ASIN: B00ARJIG6O, Item model number: ZDC-V-E11301RG, Date first listed on Amazon: December 27, 2012, Average Customer Review: 4.7 out of 5 stars 4 customer reviews
Product price: $12.99
Target attributes: Silhouette
Answer: attribute: silhouette
value: stud
source: product title
attribute: silhouette
value: studs
source: product feature