Several high-end jewelry brands are known to hold their value over time. Here are a few examples:

1. Cartier: Founded in 1847, Cartier is a luxury jewelry brand known for its iconic designs, including the Love bracelet and the Tank watch. Cartier jewelry is known for its high quality and craftsmanship, contributing to its value over time.
2. Tiffany & Co.: Established in 1837, Tiffany & Co. is a well-known luxury jewelry brand synonymous with quality and craftsmanship. Tiffany jewelry is known for its iconic designs, such as the Tiffany Setting engagement ring, and its use of high-quality diamonds and precious metals.
3. Van Cleef & Arpels: Founded in 1906, Van Cleef & Arpels is a French luxury jewelry brand known for its intricate designs and high-quality gemstones. Van Cleef & Arpels jewelry is often made in limited quantities, contributing to its value over time.
4. Boucheron: Founded in 1858, Boucheron is a luxury jewelry brand known for its unusual materials and intricate designs. Boucheron jewelry is often made with high-quality gemstones and precious metals, contributing to its value over time.

Overall, high-end jewelry brands known for their quality, craftsmanship, and iconic designs are more likely to hold their value over time. Purchase jewelry from a reputable dealer or brand to take good care of your jewelry to maintain its value over time.