Preheat your oven to 350 degrees F and line a loaf pan (9"x5" or 8.5"x4.5") with parchment paper, or grease well. Set aside.
In a large bowl, whisk together pumpkin puree, brown sugar, Greek yogurt, and olive oil until well-combined.
Add the egg and vanilla, and whisk again until smooth and slightly thicker.
Whisk in spices, baking soda, and salt until evenly distributed and smooth.
Dump your flour into the bowl and stir gently with a spatula or fork until a fairly smooth and well-combined batter is formed. Stop stirring once there are no pockets of flour remaining.
Fold in chocolate gems gently until evenly distributed through the batter.
Scrape batter into prepared loaf pan. Top with additional chocolate gems and turbinado sugar, if desired.
Bake for 45-55 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs attached.
Cool completely in pan on a wire rack before turning out and slicing.
