White sapphire in a tennis bracelet format delivers something the standard CZ tennis bracelet cannot: genuine gemstone identity. Lab created white sapphire has the same chemical and physical properties as mined sapphire - aluminum oxide crystal, the same hardness, the same refractive index - the difference being that it was grown in a laboratory rather than mined from the earth. At 9.52ctw in round lab sapphire stones at 0.15" wide, this bracelet in 18K gold over brass delivers the tennis bracelet comeback trend in a warm gold setting with real gemstone material. Box clasp with double safety at 7.25". The 18K yellow gold over brass creates warmth that rhodium over brass versions of this format cannot match - the gold tone makes the white sapphire read as more luxurious, the contrast between warm metal and cool white stone more visually interesting. For the wearer who wants the tennis bracelet trend with the satisfaction of genuine lab-grown gemstone material rather than CZ, this bracelet delivers the value proposition clearly.