It could mean 18 karat "hollow gold filled". I'm not familiar with a manufacturer's hallmark that is "HGF".
18k hgf would stand for 18k heavy gold filled ( not solid gold )
Heavy gold filled
18 karat heavy gold filled Cant sell for scrap
18K gold Made in Italy
"14k HGF" typically refers to a type of gold jewelry or item that is made from 14 karat gold and may include the initials "HGF," which could stand for a brand, designer, or manufacturer. The "14k" indicates that the gold is 58.3% pure, with the remaining 41.7% being other metals, which is common in jewelry for durability and color. If "HGF" has a specific context or meaning beyond that, it may require additional information to clarify.
18K Gold Brevetto Italian
18k white gold
"HGF" or hollow gold filled jewelry is considered a fine jewelry and should be treated with the same caution when cleaning. To clean HGF jewelry a solution of Mr. clean, water, and ammonia can be used. Mix half Mr. Clean and water with a small amount of ammonia. This is safe for all types of fine jewelry and is used by many jewelry stores. Allow the jewelry piece to soak for 15 seconds in this solution then rinse with water and dry.
14k-18K refers to the purity of gold in the jewelry piece. 14k gold is 58.3% pure gold, while 18K gold is 75% pure gold. The "KG" likely refers to the weight of the gold in the jewelry, measured in kilograms.
BO on jewelry is the mark of the manufacturer. 18k means that there are 18 carats of whatever metal in that piece of jewelry.
75% is total gold in your jewelry and 25% are other metals
Pretty sure that's 18 karat gold plated.