MARILYN Necklace Product Specifications Material: 18k Gold and High-Performance Titanium Shape Memory Alloy Stone Options: Diamond | Precious Stones: Ruby, Sapphire or Emerald | White Cubic Zirconia Diamonds: 0.01ct Gold Finishes: Available in YELLOW Gold, WHITE Gold, ROSE Gold, or BLACK Gold Available Diameters: S (100 mm) | M (110 mm) | L (135 mm) Extension Length: 7.5 cm (can be customized upon request) Collection: DIVA Shape Memory Technology Our signature shape memory alloy allows the jewelry to gently flex and adapt. While the initial size may vary slightly depending on how it is formed, the technology enables the piece to gradually mold to your personal size and shape over time, giving you a perfect, comfortable fit.