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: Sterling Silver Celtic Oval with Cubic Zirconia Center Drop Earrings
Product description: The Sterling Silver Celtic Oval with Cubic Zirconia Center Drop Earrings present an elegant and sleek metallic earring design that is perfect for day or night. Each French-wire backing holds an oval drop earring shape that supports a silver sphere below. The oval shape is accented with swirls which present a filigree design around a round cubic zirconia stone. The combination of sparkling stones and metallics grants the earrings an elegant and luxurious look., The Amazon Curated Collection, Discover the Amazon Curated Collection of fine and fashion jewelry. The expansive selection of high-quality jewelry featured in the Amazon Curated Collection offers everyday values that range from precious gemstone and diamond pieces to the latest fashion designs., This hand-selected assortment features an array of diamond, gemstone, and precious metal designs that receive a quality inspection, including from Amazons staff graduate gemologist, to ensure they meet Amazons high standards. All diamonds featured in the Amazon Curated Collection are certified by our suppliers to be conflict free, and IGI, GIA, or AGS certifications are provided on white diamonds of .75 carats or larger on all stud earrings, rings, and pendant necklaces., Pieces from the Amazon Curated Collection come packaged in a custom box, making them wonderful gifts. In addition, we offer free one-day shipping within the continental U.S. on items over $500. International shipping options for friends and family overseas are available for an additional fee., The Amazon Curated Collection offers a specialized customer service team that is available seven days a week to answer any product questions before, during or after the purchase. If youre not satisfied for any reason, you will receive a full refund and free return shipping within the U.S. if you return your purchase within 30 days., Find a special gift for a loved one or a beautiful piece that complements your personal style with jewelry from the Amazon Curated Collection., Cubic Zirconia, History, In 1937, Cubic Zirconia was first discovered by German mineralogists, M. V. Stackelberg and K. Chudoba. Little did they know, the tiny crystals that they discovered would move on to become a popular synthetic gemstone. It wasnt until the 1970s that Cubic Zirconia was first used in the jewelry world, when scientists began growing the crystals in the laboratory. In the 1980s, Cubic Zirconia use in jewelry continued to grow and today is it one of the most popular diamond substitutes available on the market., Composition, Cubic Zirconia is the cubic form of zirconium oxide that is created in a laboratory. Its durable material allows the synthetic stone to be molded into a variety of shapes. The stone offers brilliant shine and flawless clarity. Cubic Zirconia is available in a wide range of colors, including a colorless form that is an economically important competitor to natural diamonds., Caring For Your Cubic Zirconia Jewelry, Like natural diamonds, Cubic Zirconia needs to be cared for in order to maintain its original brilliance and shine. Clean with warm-to-hot water and a soft brush with a mild soap, then immediately dry with a clean cloth after rinsing. Avoid contact with perfume, body lotion, hairspray or any other chemical that may harm the shine of the stone.
Product feature: Gemstones may have been treated to improve their appearance or durability and may require special care., Clean with a soft damp cloth., The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture, Made in China, Package Dimensions: 3.6 x 1.9 x 0.2 inches, Shipping Weight: 0.64 ounces, ASIN: B00260HAS2, Item model number: R2AAJ50026-00LB9B0, Date first listed on Amazon: August 4, 2009, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 3.4 out of 5 stars 8 customer reviews
Product brand: Amazon Collection
Target attributes: Silhouette
Answer: attribute: silhouette
value: drop
source: product title
attribute: silhouette
value: drop
source: product description