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: BERRICLE Yellow Gold Flashed Sterling Silver Solitaire Stud Earrings Made with Swarovski Zirconia
Product description: These solitaire stud earrings offers effortlessly chic elegance for the perfect everyday style. Made of yellow gold flashed fine 925 sterling silver. Set with 2 carat round cut clear Swarovski zirconia (6.5mm) in 4-prong setting. Earrings measure 0.26 inch in length. Center posts with butterfly backs. Imported., ABOUT SWAROVSKI PURE BRILLIANCE ZIRCONIA: The Pure Brilliance cuts are truly a cut above the rest the exact symmetry and proportions of the cuts maximize brilliance and place Swarovski Zirconia in a class of its own. Every single Swarovski Zirconia is marked with a microscopic laser-engraved quality seal "SWAROVSKI ZIRCONIA" that is invisible to the naked eye and visible with jeweler loupe. The laser-engraved quality seal guarantees that these stones are of the highest precision and brilliance and meet the highest cutting standards of the diamond industry., DISCLAIMER: All Swarovski zirconia stone weights are approximate and listed as diamond equivalent weight in carats. This jewelry is crafted with Swarovski Zirconia stones only and not made by Swarovski. No Swarovski gift box or pouch. Swarovski is a registered trademark of Swarovski AG. Jewelry is not intended for children under 13 years of age. Photos may be enlarged to show details. All product measurements are approximate.
Product feature: METAL: yellow gold flashed .925 sterling silver, stamped 925, high polished finish, nickel free., PREMIUM QUALITY STONE: Main Stone: 2 carat round cut clear Swarovski zirconia (6.5mm), MEASUREMENTS: 0.26 inch in length, center posts with butterfly backs, STYLE: These solitaire stud earrings offers effortlessly chic elegance for the perfect everyday style., GIFTING: Comes with FREE BERRICLE signature jewelry box and is ready for gifting, Package Dimensions: 2.2 x 1.9 x 1.7 inches, Shipping Weight: 1.6 ounces, ASIN: B01692F5J8, Item model number: e950-sw02-6, Date first listed on Amazon: October 6, 2015, Average Customer Review: 5.0 out of 5 stars 1 customer review
Target attributes: Silhouette
Answer: attribute: silhouette
value: stud
source: product feature
attribute: silhouette
value: stud
source: product description
attribute: silhouette
value: solitaire
source: product title
attribute: silhouette
value: solitaire
source: product feature