Water diamonds, also known as aquamarines, are a popular variety of the beryl mineral. They come in various models and specifications, which include color, clarity, cut, and carat weight. The most common models of water diamonds are the Classic Cut, Emerald Cut, and Round Cut. Specifications include color ranging from light blue to deep teal, clarity grades from eye-clean to included, and cuts that enhance the stone's brilliance and sparkle.

The popularity of water diamonds is due to their unique color, which is reminiscent of the ocean. According to the American Gem Society (AGS), the most desirable color for aquamarines is a clear, bright blue, grading between 7.5 and 8.0 on the AGS color scale. The clarity of water diamonds can vary significantly, with some stones exhibiting inclusions that are visible to the naked eye and others displaying a high level of transparency. The cut of the stone is crucial as it determines the stone's overall appearance and brilliance. A well-cut water diamond will reflect light more effectively, enhancing its visual appeal.

The specifications of water diamonds are as follows:

1. Color: The color of aquamarines ranges from light blue to deep teal. The most sought-after color is a clear, bright blue, grading between 7.5 and 8.0 on the AGS color scale.

2. Clarity: Clarity grades range from eye-clean (no visible inclusions) to included (inclusions visible to the naked eye). The AGS grades clarity on a scale of 0 to 10, with 10 being the highest.

3. Cut: The cut of a water diamond can be Classic Cut, Emerald Cut, or Round Cut. Each cut has its own advantages and can enhance the stone's brilliance and sparkle.

4. Carat Weight: The carat weight of water diamonds can vary, with smaller stones typically being more affordable and larger stones being more valuable.

The demand for water diamonds is influenced by various factors, including the stone's color, clarity, cut, and carat weight. According to the Gemological Institute of America (GIA), the price of an aquamarine can range from $50 to $5,000 per carat, depending on the stone's quality. The most valuable water diamonds are those with a clear, bright blue color, high clarity, and an excellent cut.

In conclusion, water diamonds come in various models and specifications, with the most popular being the Classic Cut, Emerald Cut, and Round Cut. The color, clarity, cut, and carat weight are the key specifications that determine the value and beauty of a water diamond. The demand for these stones is driven by their unique color and the quality of their craftsmanship.