# Reference Curve

### **Step 1:  Curve Command**

To begin with our final model in the collection, go to the **Shanks** tab and click on the **Curve** command.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Group-2.png)

### **Step 2:  Ring Size**

Create a reference curve by selecting **United States** and size **7**.

<figure><img src="https://www.rhinoartisan.com/wp-content/uploads/2024/07/image-1-2.png" alt=""><figcaption></figcaption></figure>

### **Step 3: Gem Studio**

Then, go to the **Diamonds** tab and use the **Gem Studio** command. Change the diameter to **6 millimeters** and add the gem.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Group-70-1024x155.jpg)

### **Step 4:**  OSnap and Move

Type **move** in the command bar and select the bottom point of the gem. Move it to the top of the curve.

![](https://3375153115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F5uhW8FwQpXQj8tHUULMo%2Fuploads%2FEO7mZPG6x7EgVfTdK618%2FPosition.png?alt=media\&token=27c35db3-20cf-4755-84f7-6e65c4d7cadc)

### **Step 5: Gem Position**

Using the **Gumball**, move the gem **0.3 millimeters** along the Y-axis.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/GEm-0.3-1024x407.png)

### **Step 6: Circle Command**

Now, create a new curve in the **Curve** tab. Use the **Circle** command.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Circle-Command-1.png)

### **Step 7:  Create a new Curve**

Select the center point by typing **0** and pressing Enter. Then, use the gem's fillet as a reference to create the curve, which will help position the elements of our ring accurately.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Filetin-1024x302.png)

### **Video Lesson**

{% embed url="<https://www.rhinoartisan.com/wp-content/uploads/2024/07/Lesson-1-R.mp4>" %}

**Next Step:** Measure the length of the curve to create the reference line.