What string would you recommend for simple necklaces like these

The String of Love Necklace - 14K Yellow Gold | Gift for Her | Magal Jewelry

60PCS DIY Chinese Knot Rope Creative DIY Necklace Cord Simple DIY Jewelry Making String Multi-purpose DIY Necklace Rope for Neck

Simple Pleasures Pearl Necklace SS - Bell Farm Shops

I usually wear this little pendant on a string like this but the knot of course moves around my neck all day and drives me crazy. Anybody know how I could maybe

String Necklace

200pcs Wax String Necklace Pendants Hide Rope Necklace Props Jewelry Accessory Sling Pendants (Black)

Fashion Guitar Pendant Necklace Simple Clavicle Chain Necklace Sweater Chain Hip Hop Charm Necklace Party Jewelry Guitar Pendant Necklace Jewelry Fashion String Instrument : Sports & Outdoors

HARFINGTON 10pcs Waxed Necklace Cord Bulk, 23 Inches and 2mm Dia Necklace String Rope with Clasp for Pendants, Bracelets, Necklaces, Jewelry Making Beading Supplies, Blue

The 0.6mm Elastic Stretch Cord is a top-quality and flexible cord commonly used in jewelry making. This durable cord is specifically designed to stretch and retract, providing comfortable and secure wear. Made from synthetic materials like nylon or polyester, this cord is sold on a spool with 100 meters of cord, providing ample material for various jewelry-making projects.

Expo International Elastic String Cord, 0.6 mm Wide Premium Stretchy String Cord for Jewelry Making, Thin Bracelet Cord, Versatile Jewelry Cord

Fashion Natural Stone Beaded Necklace for Men Women Yoga Healing Anxiety Relief