If you're looking for custom diamond chains and other real custom jewelry made online and shipped to you, there are several reputable options to consider. When seeking such services, it's essential to work with trusted and established jewelers or custom jewelry makers to ensure the authenticity and quality of your jewelry. Here are some options to explore:

1. Local Jewelry Stores: Many local jewelry stores offer custom jewelry services, and you can visit their websites or contact them to inquire about custom diamond chains and other jewelry options. They may be able to work with you remotely and then ship the finished product to you.
2. Online Custom Jewelry Retailers: There are numerous online retailers specializing in custom jewelry, including custom Diamond Chain. Popular websites like Xzlove Jewelry, Blue Nile, James Allen, and Brilliant Earth offer customization options, allowing you to design your own jewelry and have it delivered to your doorstep.
3. Etsy: Etsy is a popular online marketplace known for its handmade and custom jewelry. You can find many independent jewelers and artisans who offer custom diamond chains and other unique pieces. Be sure to read reviews and communicate with sellers to ensure the authenticity and quality of their products.
4. Custom Jewelry Designers: Some jewelry designers and artisans specialize in creating one-of-a-kind, custom pieces. You can find them through online platforms or by searching for jewelry designers in your area. Look for experienced professionals with a portfolio of their work.
5. Reputable Auction Houses: Some well-known auction houses, such as Sotheby's and Christie's, offer online auctions and private sales for high-end, custom jewelry pieces. These organizations typically ensure the authenticity of the items they sell.
6. Verified Online Marketplaces: Platforms like 1stdibs and TrueFacet curate collections of fine jewelry and offer verified, authentic pieces. You can search for custom diamond chains and other jewelry items on these platforms.

When ordering custom jewelry online, it's crucial to:

1. Verify the reputation and credentials of the seller.
2. Insist on proper documentation, including certificates of authenticity for diamonds and other gemstones.
3. Clearly communicate your design preferences, including the type of metal, diamond quality, and any other custom features.
4. Review the return and warranty policies of the seller.
5. Consider working with a jeweler who offers secure and insured shipping to protect your purchase during transit.

By following these tips and doing your due diligence, you can find a trusted source for real custom diamond chains and other custom jewelry online, ensuring both authenticity and quality.