Чтобы дойти до цели, человеку нужно только одно. Идти

PIbd-23_Panina.A.D_JewelryStore/PIbd-23_Panina.A.D_JewelryStore/IComponentModel.cs

@@ -0,0 +1,10 @@
+using JewelryShopDataModels;
+
+namespace JewelryStoreDataModels.Models
+{
+    public interface IComponentModel : IId
+    {
+        string ComponentName { get; }
+        double Cost { get; }
+    }
+}

PIbd-23_Panina.A.D_JewelryStore/PIbd-23_Panina.A.D_JewelryStore/IId.cs

@@ -0,0 +1,7 @@
+namespace JewelryShopDataModels
+{
+    public interface IId
+    {
+        int Id { get; }
+    }
+}

PIbd-23_Panina.A.D_JewelryStore/PIbd-23_Panina.A.D_JewelryStore/IJewelModel.cs

@@ -0,0 +1,11 @@
+using JewelryShopDataModels;
+
+namespace JewelryStoreDataModels.Models
+{
+    public interface IJewelModel : IId
+    {
+        string JewelName { get; }
+        double Price { get; }
+        Dictionary<int, (IComponentModel, int)> JewelComponents { get; }
+    }
+}

PIbd-23_Panina.A.D_JewelryStore/PIbd-23_Panina.A.D_JewelryStore/IOrderModel.cs

@@ -0,0 +1,15 @@
+using JewelryShopDataModels;
+using JewelryStoreDataModels.Enums;
+
+namespace JewelryStoreDataModels.Models
+{
+    public interface IOrderModel : IId
+    {
+        int JewelId { get; }
+        int Count { get; }
+        double Sum { get; }
+        OrderStatus Status { get; }
+        DateTime DateCreate { get; }
+        DateTime? DateImplement { get; }
+    }
+}

PIbd-23_Panina.A.D_JewelryStore/PIbd-23_Panina.A.D_JewelryStore/OrderStatus.cs

@@ -0,0 +1,11 @@
+namespace JewelryStoreDataModels.Enums
+{
+    public enum OrderStatus
+    {
+        Неизвестен = -1,
+        Принят = 0,
+        Выполняется = 1,
+        Готов = 2,
+        Выдан = 3
+    }
+}