diff --git a/offchain/tests/admin/pellets/create-pellets.ts b/offchain/tests/admin/pellets/create-pellets.ts
index 0dc0669..ac63d1b 100644
--- a/offchain/tests/admin/pellets/create-pellets.ts
+++ b/offchain/tests/admin/pellets/create-pellets.ts
@@ -3,6 +3,6 @@ import { createPellets } from "../../../transactions/admin/pellets/create-pellet
 import { readPelletsCSV } from "./utils.ts";
 import { printTxURL } from "../../../utils.ts";
 
-const params = await readPelletsCSV("tests/admin/pellets.csv");
+const params = await readPelletsCSV("tests/admin/pellets/pellets.csv");
 const txHash = await createPellets(admin_token, params);
 printTxURL(txHash);
diff --git a/offchain/tests/admin/pellets/sample-pellets.ts b/offchain/tests/admin/pellets/sample-pellets.ts
index bca9085..70487d9 100644
--- a/offchain/tests/admin/pellets/sample-pellets.ts
+++ b/offchain/tests/admin/pellets/sample-pellets.ts
@@ -1,4 +1,10 @@
-import { getDiamondAreaSample, writePelletsCSV } from "./utils.ts";
+import {
+  getRingAreaSample,
+  getDiamondAreaSample,
+  writePelletsCSV,
+} from "./utils.ts";
 
-const pellets = getDiamondAreaSample(20n, 30n, 0.15);
-writePelletsCSV(pellets, "tests/admin/pellets/sample1.csv");
+const pellets = getRingAreaSample(20, 30, 30n, 80n, 0.15);
+//const pellets = getDiamondAreaSample(0n, 9n, 30n, 50n, 0.05);
+
+writePelletsCSV(pellets, "tests/admin/pellets/circle1.csv");
diff --git a/offchain/tests/admin/pellets/utils.ts b/offchain/tests/admin/pellets/utils.ts
index 86aa62f..c91ecbd 100644
--- a/offchain/tests/admin/pellets/utils.ts
+++ b/offchain/tests/admin/pellets/utils.ts
@@ -1,5 +1,8 @@
 import { parse, stringify } from "jsr:@std/csv";
 
+type Coordinates = Array<{ pos_x: bigint; pos_y: bigint }>;
+type PelletParams = Array<{ fuel: number; pos_x: bigint; pos_y: bigint }>;
+
 function getRandomSubarray<T>(arr: Array<T>, size: number) {
   const shuffled = arr.slice(0);
   let i = arr.length,
@@ -20,83 +23,147 @@ function getRandomSubarray<T>(arr: Array<T>, size: number) {
  * actual "circumferences" (set of points equidistant from the center) in our geometry.
  * @param r Diamond diagonal.
  */
-function getDiamondCoordinates(
-  r: bigint
-): Array<{ pos_x: bigint; pos_y: bigint }> {
-  const cs = [];
+function getDiamondCoordinates(r: bigint): Coordinates {
+  const coordinates = [];
   for (let i = 0n; i < r; i++) {
-    cs.push({
+    coordinates.push({
       pos_x: r - i,
       pos_y: i,
     });
-    cs.push({
+    coordinates.push({
       pos_x: -r + i,
       pos_y: -i,
     });
-    cs.push({
+    coordinates.push({
       pos_x: -i,
       pos_y: r - i,
     });
-    cs.push({
+    coordinates.push({
       pos_x: i,
       pos_y: -r + i,
     });
   }
-  return cs;
+  return coordinates;
 }
 
 /**
- * Returns an array with a random sample of pellet parameters on the perimeter
- * of a diamond with diagonal r.
- * @param r Diamond diagonal.
- * @param density Density of the sample: equals 1 if every diamond point is taken. Must be in the range 0 - 1, inclusive.
+ * Returns an array with the coordinates of the points that lie in the
+ * area between two diamonds with diagonals inner_r and outer_r respectively.
+ * @param inner_r Inner diamond diagonal. Must be greater than or equal to 0.
+ * @param outer_r Outer diamond diagonal. Must be greater than or equal to inner_r.
  */
-function getDiamondSample(
-  r: bigint,
-  density: number
-): Array<{ fuel: number; pos_x: bigint; pos_y: bigint }> {
-  if (density > 1 || density < 0) {
-    throw Error("Density must be a number between 0 and 1.");
+function getDiamondAreaCoordinates(
+  inner_r: bigint,
+  outer_r: bigint
+): Coordinates {
+  if (inner_r < 0 || inner_r > outer_r) {
+    throw Error(
+      "inner_r must be a positive number less than or equal to outer_r"
+    );
   }
-  const cs = getDiamondCoordinates(r);
-  const sample_size = Math.floor(cs.length * density);
-  const sample_cs = getRandomSubarray(cs, sample_size);
-  const pellets = sample_cs.map((c) => ({
-    fuel: Math.floor(Math.random() * 60 + 30), //random amount between 30 and 90.
-    pos_x: c.pos_x,
-    pos_y: c.pos_y,
-  }));
-  return pellets;
+  const coordinates = [];
+  for (let r = inner_r; r <= outer_r; r++) {
+    coordinates.push(getDiamondCoordinates(r));
+  }
+  return coordinates.flat();
 }
 
 /**
  * Returns an array with a random sample of pellet parameters over the area
  * between two diamonds with diagonals inner_r and outer_r respectively.
  * @param inner_r Inner diamond diagonal. Must be greater than or equal to 0.
- * @param Outer_r Outer diamond diagonal. Must be greater than or equal to inner_r.
+ * @param outer_r Outer diamond diagonal. Must be greater than or equal to inner_r.
+ * @param min_fuel Minimum fuel held by the sample pellets. Must be greater than or equal to 0.
+ * @param max_fuel Maximum fuel held by the sample pellets. Must be greater than or equal to min_fuel.
  * @param density Density of the sample: equals 1 if every diamond point is taken. Must be in the range 0 - 1, inclusive.
  */
 function getDiamondAreaSample(
   inner_r: bigint,
   outer_r: bigint,
+  min_fuel: bigint,
+  max_fuel: bigint,
   density: number
-): Array<{ fuel: number; pos_x: bigint; pos_y: bigint }> {
+): PelletParams {
+  if (density > 1 || density < 0) {
+    throw Error("Density must be a number between 0 and 1.");
+  }
+  if (min_fuel < 0 || min_fuel > max_fuel) {
+    throw Error(
+      "min_fuel must be a positive number less than or equal to max_fuel"
+    );
+  }
+  const coordinates = getDiamondAreaCoordinates(inner_r, outer_r);
+  const sample_size = Math.floor(coordinates.length * density);
+  const sample_coordinates = getRandomSubarray(coordinates, sample_size);
+  const pellets = sample_coordinates.map((c) => ({
+    fuel: Math.floor(
+      Math.random() * Number(max_fuel - min_fuel) + Number(min_fuel)
+    ),
+    pos_x: c.pos_x,
+    pos_y: c.pos_y,
+  }));
+  return pellets;
+}
+
+/**
+ * Returns an array with the coordinates of the points that lie in the
+ * area between two circles with radii inner_r and outer_r respectively.
+ * @param inner_r Inner circle radius. Must be greater than or equal to 0.
+ * @param outer_r Outer circle radius. Must be greater than or equal to inner_r.
+ */
+function getRingAreaCoordinates(inner_r: number, outer_r: number): Coordinates {
   if (inner_r < 0 || inner_r > outer_r) {
     throw Error(
       "inner_r must be a positive number less than or equal to outer_r"
     );
   }
-  const pellets = [];
-  for (let r = inner_r; r <= outer_r; r++) {
-    pellets.push(getDiamondSample(r, density));
-  }
-  return pellets.flat();
+  const x_bound = Math.floor(outer_r);
+  const xs = Array.from({ length: 2 * x_bound + 1 }, (_, i) => i - x_bound);
+  const coordinates = xs.map((x) => {
+    const y_outer_bound = Math.floor(Math.sqrt(outer_r ** 2 - x ** 2));
+    let ys = Array.from(
+      { length: 2 * y_outer_bound + 1 },
+      (_, i) => i - y_outer_bound
+    );
+    if (Math.abs(x) < Math.abs(inner_r)) {
+      const y_inner_bound = Math.floor(Math.sqrt(inner_r ** 2 - x ** 2));
+      ys = ys.filter((y) => Math.abs(y) > y_inner_bound);
+    }
+    return ys.map((y) => ({ pos_x: BigInt(x), pos_y: BigInt(y) }));
+  });
+  return coordinates.flat();
+}
+
+/**
+ * Returns an array with a random sample of pellet parameters over the area
+ * between two circles with radii inner_r and outer_r respectively.
+ * @param inner_r Inner diamond diagonal. Must be greater than or equal to 0.
+ * @param outer_r Outer diamond diagonal. Must be greater than or equal to inner_r.
+ * @param min_fuel Minimum fuel held by the sample pellets. Must be greater than or equal to 0.
+ * @param max_fuel Maximum fuel held by the sample pellets. Must be greater than or equal to min_fuel.
+ * @param density Density of the sample: equals 1 if every diamond point is taken. Must be in the range 0 - 1, inclusive.
+ */
+function getRingAreaSample(
+  inner_r: number,
+  outer_r: number,
+  min_fuel: bigint,
+  max_fuel: bigint,
+  density: number
+): PelletParams {
+  const coordinates = getRingAreaCoordinates(inner_r, outer_r);
+  const sample_size = Math.floor(coordinates.length * density);
+  const sample_coordinates = getRandomSubarray(coordinates, sample_size);
+  const pellets = sample_coordinates.map((c) => ({
+    fuel: Math.floor(
+      Math.random() * Number(max_fuel - min_fuel) + Number(min_fuel)
+    ),
+    pos_x: c.pos_x,
+    pos_y: c.pos_y,
+  }));
+  return pellets;
 }
 
-function writePelletsCSV(
-  pellets: Array<{ fuel: number; pos_x: bigint; pos_y: bigint }>,
-  path: string
-) {
+function writePelletsCSV(pellets: PelletParams, path: string) {
   const csv = stringify(pellets, {
     columns: ["fuel", "pos_x", "pos_y"],
   });
@@ -119,4 +186,9 @@ async function readPelletsCSV(path: string) {
   return params;
 }
 
-export { getDiamondAreaSample, writePelletsCSV, readPelletsCSV };
+export {
+  getDiamondAreaSample,
+  getRingAreaSample,
+  writePelletsCSV,
+  readPelletsCSV,
+};