Sterling Silver Oval Textured Turquoise Drop Earrings

September's birthstone rests proudly in a shining setting on this 14k white gold pendant featuring emerald-cut sapphire (1/6 ct. t.w.) and round-cut diamond (1/4 ct. t.w.). Approximate length: 18 inches. Approximate drop: 3/4 inch.

Ever since you were a little girl you loved sparkle, and some things never change. This v-shaped B. Brilliant necklace features a solid cubic zirconia chain with a graduated cubic zirconia drop (24-3/8 ct. t.w.). Approximate length: 17 inches. Approximate drop: 1/2 inch.

Build imaginative machines in this creative and addictively fun brainteaser

Turn cranks, rotate gears, pull levers, and more to build unique contraptions

Solve more than 200 challenging puzzles; put your machines to work

Physics engine with air-pressure, electricity, gravity, and particle effects

Experiment with gears, robots, explosives, and more in your own virtual lab