NATURAL TURQUOISE ENCYCLOPEDIA

Turquoise is an opaque blue-to-green gemstone formed when copper-bearing water interacts with aluminium- and phosphorus-rich rocks. It has been treasured for thousands of years and is commonly cut as cabochons, beads, and carved forms. Turquoise measures about 5 to 6 on the Mohs hardness scale, so it needs thoughtful care in everyday jewelry.

COLOR, MATRIX, AND NATURAL CHARACTER

Turquoise ranges from pale blue and vivid sky blue to green and blue-green. A web of darker host rock in the stone is called matrix. Some buyers prefer an even, matrix-free color; others value the natural web-like patterns. Color and matrix vary from stone to stone, and appearance alone cannot confirm a stone’s identity, origin, or treatment.

HOW TURQUOISE QUALITY IS JUDGED

Color: Consider hue, tone, saturation, and how evenly the color is distributed.

Texture and stability: Fine, compact material is generally more durable than soft, porous material. Natural turquoise can be porous and may change with wear.

Matrix and pattern: Look at the pattern, contrast, and how it works with the cut. Matrix is a natural feature, not a quality grade by itself.

Craftsmanship: Check the polish, shape, symmetry, setting, and finish of the jewelry.

Size and overall appearance: Evaluate the finished stone as a whole. Larger size alone does not make a piece finer.

TREATMENTS, IMITATIONS, AND DISCLOSURE

Some turquoise is stabilized or impregnated with wax, resin, or polymer to improve its appearance and durability. Other material may be dyed, reconstructed from small pieces, synthetic, or an imitation made from a different material. These categories are not interchangeable. Ask the seller to state clearly whether the stone is turquoise, whether it has been treated, and whether the material is natural, reconstructed, synthetic, or an imitation. For a valuable purchase, rely on a qualified gemological laboratory report rather than a home test.

CARING FOR TURQUOISE

Clean turquoise gently with warm, soapy water and a soft cloth, then dry it. Do not use steam or ultrasonic cleaners. High heat, chemicals, cosmetics, perfume, and skin oils can discolor or damage turquoise, especially treated material. Put turquoise jewelry on after applying lotions, makeup, sunscreen, or hairspray, and store it separately from harder gemstones.

A THOUGHTFUL TURQUOISE PURCHASE

Ask for a clear description of the stone and any treatments, and keep the written details with your jewelry records. This guide is educational; a gemological laboratory can examine an individual stone.