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: 2 3/4 Carat Solitaire Diamond Stud Earrings Round Cut 4 Prong Push Back Platinum (I-J Color, I1-I2 Clarity)
Product description: 2 3/4 Carat Solitaire Diamond Stud Earrings Round Cut 4 Prong Push Back Platinum (I-J Color, I1-I2 Clarity)
Product feature: Houston Diamond District offers a 30 day return policy on all of its products, We only sell 100% Natural, conflict free diamonds., Direct Manufacturer Prices & Free Certificate of Authenticity, Shipping Weight: 3.04 ounces ( View shipping rates and policies ), ASIN: B00XQ0Y5AW, Item model number: SEG SOEG PLT 14420W 1 HI HDD 1, Date first listed on Amazon: February 24, 2014, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product price: $5,012.00
Product brand: Houston Diamond District
Target attributes: Silhouette
Answer: attribute: silhouette
value: stud
source: product description
attribute: silhouette
value: solitaire
source: product title
attribute: silhouette
value: stud
source: product title