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The most precious stones are the diamonds, emeralds, rubies and sapphires. The pearl is oftentimes classed with precious stones. Although strictly speaking while it is not a stone it holds an esteemed place in jewelry.A large number of stones used in jewelry are known as semi-precious.

Ergonomic wheelchair series provides users with a large selection of ultra lightweight wheelchairs that can help improve your life. This series has features that include a high strength lightweight frame, foldable and easy to store, breathable anti-bacterial, anti-staining, removable and machine washable cushion. Also includes the exclusive S-Shape Seating System, which provides increased stability, better weight distribution and lowers the risk of pressure sores and spinal injury. The patented S-Shape Seating System that comes with every wheelchair model in this series provides an ergonomic seating frame that conforms and flexes to the shape of your body. Feature Ultra-Lightweight Frame & Riggings Ergonomic S-Shape Seat Frame Ergonomic grip built into the wheels you propel yourself in Relieves pressure throughout your body T6 Aircraft Grade Aluminum Fusion of form and function at its best with modern stylish designs and options Tube In Center designed footrests protects legs from impacts Extra wide and ergonomic concave arm pads and foldable backrest S Ergo 115 Wheelchair Wheelchairs provide variable mobility to people with various physical disabilities. There are four major types of wheelchairs: indoor, outdoor, combined and special. Ergonomics, or design of equipment to prevent injury, considers all physical and anatomical limitations of the users.A complete assessment may prevent future injury, and improve mobility. Seat Width The width of the wheelchair seat is based on the users' widest point, usually the hips or thighs. If shoulders are wide, consider the shoulder width when choosing a seat width. A too-wide seat leads to difficulty in mobility, inadequate support and discomfort. A narrow seat contributes to pressure sores, inadequate support and discomfort. It is important to have an exact measurement of the seat width for optimal mobility and environmental accessibility. Seat Depth The seat depth is measured from the back of th