A ring with a rotation and a lock function to display multiple anniversaries, the ring comprising: a main ring including engagement areas that engagement grooves are positioned on and distant areas positioned between the engagement areas; a sub ring (SR1, SR2) engaged with the main ring in a rotatable and fixable way, and engagement members positioned between the main ring and the sub ring, wherein the subring includes a receiver that receives an engagement member; wherein the receiver includes a first side, a second side facing the first side and connected to an opening area, a third and a fourth side respectively connecting between the first and the second side; wherein the engagement member is made of materials having elasticity and positioned in the receiver; wherein when the opening area is aligned with the engagement groove area, a portion of the engagement member is protruded from the receiver outwardly and engaged with the engagement groove; wherein when the opening area is aligned with the distant area, the portion of the engagement member is inserted in the receiver, characterized in that a length of the opening area in a first direction is shorter than a length of the first side in the first direction, and wherein the main ring includes: a first part extended in the first direction, a third part spaced apart from the first part in a second direction intersecting the first direction, a fifth part spaced part from the first part in an opposite direction to the second direction, a second part connecting between the first and the third part (P1, P3), and a fourth part connecting between the first and the fifth part (P1, P5). a main ring including engagement areas that engagement grooves are positioned on and distant areas positioned between the engagement areas; a sub ring (SR1, SR2) engaged with the main ring in a rotatable and fixable way, and engagement members positioned between the main ring and the sub ring, wherein the subring includes a receiver that receives an engagement member; wherein the receiver includes a first side, a second side facing the first side and connected to an opening area, a third and a fourth side respectively connecting between the first and the second side; wherein the engagement member is made of materials having elasticity and positioned in the receiver; wherein when the opening area is aligned with the engagement groove area, a portion of the engagement member is protruded from the receiver outwardly and engaged with the engagement groove; wherein when the opening area is aligned with the distant area, the portion of the engagement member is inserted in the receiver, characterized in that a length of the opening area in a first direction is shorter than a length of the first side in the first direction, and wherein the main ring includes: a first part extended in the first direction, a third part spaced apart from the first part in a second direction intersecting the first direction, a fifth part spaced part from the first part in an opposite direction to the second direction, a second part connecting between the first and the third part (P1, P3), and a fourth part connecting between the first and the fifth part (P1, P5). a first part extended in the first direction, a third part spaced apart from the first part in a second direction intersecting the first direction, a fifth part spaced part from the first part in an opposite direction to the second direction, a second part connecting between the first and the third part (P1, P3), and a fourth part connecting between the first and the fifth part (P1, P5).