# Reference Curve and Gem
### **Step 1: Shank: Curve Command**
In the **Shanks** tab, create a reference curve.
### **Step 2: Ring Size**
Set the region to **"United States of America"** and select size **7**.
### **Step 3: Gems Studio**
Go to the **Diamonds** tab and use the **Gem Studio** command.
### **Step 4: Create the gem**
Create a **0.35-carat gem**.
### **Step 5: Osnap**
With the Osnap aid activated, type **Move** in the command bar.
### **Step 6: Gem Position**
Select the **bottom vertex** of the gem and place it on the **top** of the reference curve.
Using the gumball, move the gem **2 millimeters upward** from the culet.
### **Video Lesson**
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**Next Step:** Add a peg head setting to hold the gem.
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