Tennis Necklace, Moissanite or Zircon in s925 Silver

A tennis necklace is heavy by design, because it is stone and metal the whole way round with no light chain section at the back. That weight is why the build matters. Each stone sits in a three claw head on its own link, and the links are articulated so the line lies flat against the collarbone instead of bridging across it. A box clasp with a safety catch takes the load, which is the part worth checking on any piece like this.

You pick moissanite or zircon for the full line. Moissanite is harder, 9.25 against zircon's softer surface, so after a few years of collars and seatbelts the facets are still sharp and the row still flashes. Its refractive index of about 2.65 beats diamond's 2.42, which is why a long line of it looks lit rather than merely white. Zircon costs much less, reads well at first and makes sense for a piece worn occasionally.

Lengths run from 43cm up to 61cm and change the piece completely. The 43cm and 45cm sit on the collarbone and work with an open collar or a bare neckline. The 48cm and 51cm are the most ordered, falling just below and layering easily with a pendant. The 56cm and 61cm sit on the chest, over a shirt or a crew neck. Rose, white and yellow gold plating are available over s925 sterling silver.

• Stone: moissanite or zircon
• Metal: s925 sterling silver, 18k white gold plated
• Finish: rose gold, white gold or yellow gold
• Lengths: 43cm, 45cm, 48cm, 51cm, 56cm, 61cm and up
• Build: three claw heads on articulated links, box clasp
• Note: the GRA certificate applies to the moissanite option only