using CC_SYNTHESIZE with CCSprite extended class return same value on each instance on ccTouchBegan

cocos2d-x C++
#1

hey
im using CC_SYNTHESIZE to create getter and setters for my CCSprite extended class
when i create new instannces and preform ccTouchBegan on the object its gives me the same ( first object ) results
for example :

class Gem :public CCSprite , public CCTargetedTouchDelegate 
{
public:
    Gem();
    ~Gem();
    CC_SYNTHESIZE(std::string,gemId,GemId);
    virtual bool init ();
    CREATE_FUNC (Gem);
    virtual bool ccTouchBegan(CCTouch* touch, CCEvent* event);
}

bool Gem::ccTouchBegan(CCTouch* touch, CCEvent* event)
{   
    if (m_state != kPaddleStateUngrabbed) 
    {

        return false;
    }
    if ( !containsTouchLocation(touch) ) 
    {

        return false;
    }

    m_state = kPaddleStateGrabbed;

    CCLOG("Gem Touched! %s %s",getImageName().c_str(),getGemId().c_str());   // this is allways prints the same values 
    return true;
}

and now i have the GameLayer that creates the gems :

void GameLayer::loadGemsIntoBoard()
{
     for(int i=0;iinitWithSpriteFrameName(spritename);
    thisGem->setRowNum(row);
    thisGem->setColNum(col);
    thisGem->setGemType((GemType)gemNum);
    thisGem->setGemState(kGemNew);
    std::string ss(spritename);
    thisGem->setImageName(ss);
    thisGem->setGameLayer(this);
    thisGem->setGemId(spriteid);
    thisGem->setTag(ObjOnLayer::typeGEM);    
    thisGem->setPosition(setPositionForGem(row,col,thisGem->getSize()));
    this->addChild(thisGem,kGem);
    m_GemsInPlay->addObject(thisGem);
    thisGem->release();

}

is there any static variable im missing in the CC_SYNTHESIZE ?
that cause the instances return me the same gemId?