As a subject matter expert in the field of gemstones and precious metals, I can provide you with an informed response to your question about the value of a rock in 2017. However, it's important to note that the value of a rock can vary greatly depending on its type, quality, and rarity. For instance, a common rock like granite would be worth significantly less than a precious gemstone like a diamond or an emerald.

To give you a more precise answer, we would need to know the specific type of rock in question. If we're talking about a precious or semi-precious stone, the value can be determined by factors such as carat weight, cut, color, and clarity for gemstones, or by weight and purity for metals like gold or silver.

In the absence of specific details, it's difficult to provide an exact figure. However, as an example, if we consider the price of gold in 2017, it was approximately $1,250 per ounce at the beginning of the year, which could give you a starting point for the value of a rock if it were composed of gold.

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