Is a graduated tennis necklace different from a regular one?

Yes. The diamonds are smallest at the clasp and largest at the center front, so the necklace draws the eye to the middle. A standard tennis necklace uses stones of one size throughout.

Will 16 inches fit most people?

Sixteen inches sits close to the collarbone and suits many wearers, but it can feel tight on larger frames or over high necklines. Check your neck measurement before buying, since diamond line necklaces are hard to resize without reworking the setting.

Is 14K white gold good for a diamond necklace?

14K gold is durable enough for regular wear and is standard for fine diamond jewelry. White gold is rhodium plated for a bright finish, and that plating dulls over time and needs re-plating every few years.

How should I care for 7 carats of diamonds?

Clean with mild soap, warm water and a soft brush, and store flat or hanging separately so the stones don't scratch each other. Have the clasp and settings checked yearly, and insure the piece.

Does it come with a certificate for the diamonds?

Zales fine jewelry typically ships with its own documentation, but confirm whether a grading report is included for this piece before buying. A report matters most if you plan to resell or insure it.