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 Diamond-cut Small Number '12' Charm Pendant
Product description: 925 Sterling Silver Diamond-cut Small Number '12' Charm Pendant. Features: Solid -- Casted -- Diamond-cut -- Sterling silver. All Colored Stones Have Been Treated to Produce and Enhance Color: Amethyst - Heat Treated || Aquamarine - Heat Treated || Citrine - Heat Treated || Emerald - Resin/Oiling || Garnet & Rhodalite Garnet - Not Enhanced || Onyx - Dyed || Opal - Impregnation/Dyed/Heat || Peridot - Not Enhanced || Pearls - Bleached/Dyed/Irradiation || Pink Tourmaline Heat Treated/Irradiated || Quartz - Heat Treated/Irradiated || Ruby - Heat Treated || Sapphire - Heat Treated || Tanzanite - Heat Treated || Topaz Irradiated/Heat-Treated || Zircon Heat-treated || Blue, Red & Green Diamond Irradiated || Black, Brown & Yellow Diamond Heat Treated/Irradiated. Disclaimer: Diamonds Not verified to have 17 facets.
Product feature: 100% Satisfaction Guaranteed, 30 Day Money Back Guarantee, Upto 60% Off Retail, Venture Silver Charms Collection, ASIN: B01CTHLJ8S, Date first listed on Amazon: March 11, 2016, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: Venture Silver Charms Collection
Target attributes: Shape
Answer: attribute: shape
value: None
source: None