Here are a few options for a WordPress post_tag description for “坦桑石是什麼” in Traditional Chinese, ranging in level of detail and focus:

**Option 1: Concise and Informative**

> 坦桑石是什麼？了解珍貴寶石坦桑石的定義、產地和特性。想知道更多關於坦桑石的知識嗎？這裡提供您快速入門指南。

**Translation:** What is Tanzanite? Learn about the definition, origin, and characteristics of the precious gem Tanzanite. Want to know more about Tanzanite? Here’s a quick start guide.

**Option 2: Benefit-Oriented**

> 探索坦桑石的奧秘！想知道坦桑石的價值、顏色、以及如何挑選嗎？這個標籤彙集了所有你需要了解關於坦桑石的資訊，讓你成為寶石專家！

**Translation:** Discover the Mystery of Tanzanite! Want to know the value, colors, and how to choose Tanzanite? This tag gathers all the information you need to know about Tanzanite, making you a gem expert!

**Option 3: Keywords and SEO Focused**

> 坦桑石是一種什麼寶石？這裡包含有關坦桑石的所有資訊，包括坦桑石的顏色、價值、原產地、保養以及购买建議。透過此標籤，獲取坦桑石的最新情報，讓您輕鬆了解藍色寶石坦桑石。

**Translation:** What kind of gem is Tanzanite? This includes all information about Tanzanite, including the color, value, origin, care, and buying suggestions of Tanzanite. Through this tag, get the latest information on Tanzanite, allowing you to easily understand the blue gem Tanzanite.

**Option 4: Simplest and most direct**

> 探索坦桑石：關於坦桑石的說明和資訊。

**Translation:** Explore Tanzanite: Descriptions and information about Tanzanite.

**Key Considerations When Choosing:**

* **Your Website’s Tone:** Reflect the overall style of your website (formal, casual, informative, etc.).
* **SEO:** Include relevant keywords like “坦桑石” (Tanzanite), “寶石” (gem), “藍色寶石” (blue gem), and other terms related to its characteristics like “價值” (value), “顏色” (color), etc.
* **Target Audience:** Consider what your readers are most interested in (e.g., value, beauty, where to buy).
* **Length Limits:** Keep it relatively short, as descriptions are often displayed in a limited space.
* **Clarity:** Prioritize easy-to-understand language.

I recommend using **Option 2 or 3** if you want to emphasize benefits and keywords. **Option 1** is good for a beginner-friendly and general guideline. **Option 4** is simplest if you don’t need many details. Choose the one that best suits your needs and audience. Remember that you can edit this description later.